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TO DO app: can't join list

Iman Khademagha 155 Reputation points
2025-12-31T17:21:53.8633333+00:00

Shared a list with someone within my organization. When they click to join, they get this error:

"Can't join list. It looks like this list isn't available. Try contacting the person who invited you".

I checked the "manage access" tab and I do not have the setting toggled that disabled new members from joining the list. We are both within the same organization and have the Microsoft 365 version, not the consumer version. Why is this happening?

Microsoft 365 and Office | To Do | For business

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  1. Ashley 25 Reputation points
    2026-01-11T19:28:06.14+00:00

    FYI: I successfully joined our shared list created on 1/4. Same list, same invite link. I hope it's working for everyone else too!

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  2. Christopher Vorse 10 Reputation points
    2026-01-09T13:44:40.69+00:00

    Status: serviceDegradation

    Start Time: Mon Dec 29 15:00:00 2025

    End Time: N/A

    Service: Microsoft 365 suite

    Feature Group: Portal

    Classification: advisory

    Last Updated: Thu Jan 8 11:44:19 2026

    Root Cause: A recent change to add optimizations when sharing To Do lists introduced a misconfiguration which is resulting in impact.

    Next Update: Friday, January 9, 2026, at 5:00 PM UTC

    Details

    Time: Thu Jan 8 11:44:19 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: We're completing the final validations prior to initiating the reversion process which we anticipate will begin by our next scheduled communications update.

    Scope of impact: This issue may potentially impact any user attempting to access shared Microsoft To Do lists.

    Start time: Monday, December 29, 2025, at 8:00 PM UTC

    Root cause: A recent change to add optimizations when sharing To Do lists introduced a misconfiguration which is resulting in impact.

    Next update by: Friday, January 9, 2026, at 5:00 PM UTC

    Time: Wed Jan 7 14:26:34 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: We've identified a recent change, intended to add optimizations when sharing To Do lists, that's introduced a misconfiguration and is resulting in impact. We're reverting this change to resolve the issue, and we'll provide a timeline for remediation as one becomes available.

    Scope of impact: This issue may potentially impact any user attempting to access shared Microsoft To Do lists.

    Start time: Monday, December 29, 2025, at 8:00 PM UTC

    Root cause: A recent change to add optimizations when sharing To Do lists introduced a misconfiguration which is resulting in impact.

    Next update by: Thursday, January 8, 2026, at 6:30 PM UTC

    Time: Tue Jan 6 19:36:24 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: We're continuing to analyze a reproduction of the impact within our internal testing environment as well as reviewing recent updates.

    Scope of impact: This issue may potentially impact any user attempting to access shared Microsoft To Do lists.

    Start time: Monday, December 29, 2025, at 8:00 PM UTC

    Next update by: Wednesday, January 7, 2026, at 8:00 PM UTC

    Time: Tue Jan 6 16:44:01 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: We're analyzing a reproduction of impact within our internal testing environment along with reviewing recent updates to Microsoft To Do, to isolate potential discrepancies and to determine our next troubleshooting steps.

    Scope of impact: This issue may potentially impact any user attempting to access shared Microsoft To Do lists.

    Next update by: Wednesday, January 7, 2026, at 2:00 AM UTC

    Time: Tue Jan 6 13:22:33 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: Our investigation of service logs indicates that requests to access Microsoft To Do lists are returning 'not found'. We're continuing our analysis of these logs to further isolate the root cause of impact and develop a remediation strategy.

    Scope of impact: This issue may potentially impact any user attempting to access shared Microsoft To Do lists.

    Next update by: Tuesday, January 6, 2026, at 10:00 PM UTC

    Time: Tue Jan 6 02:48:43 2026

    Description:

    Title: Users may be unable to access shared Microsoft To Do lists

    User impact: Users may be unable to access shared Microsoft To Do lists.

    More info: Users may also be unable to open shared To Do list invitation links.

    Current status: We're analyzing system logs including any recent changes to assist in identifying the source of the issue, which will help us determine our next troubleshooting steps.

    Scope of impact: This issue may potentially impact any user attempting to access a shared Microsoft To Do lists.

    Next update by: Tuesday, January 6, 2026, at 7:30 PM UTC

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  3. Filip Östman 5 Reputation points
    2026-01-07T16:49:45.1566667+00:00

    Same problem here can't share todo list between personal accounts.

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  4. Ingvar Högni Ragnarsson 5 Reputation points
    2026-01-07T14:55:12.84+00:00

    Hi - I also have the same issue - can´ not add people to tasks and list in To do app or web version. We all work in the same organization with work accounts from Microsoft.

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  5. Vy Nguyen 11,390 Reputation points Microsoft External Staff Moderator
    2025-12-31T17:59:38.2133333+00:00

    Hi @Iman Khademagha, 

    Thank you for posting your question in the Microsoft Q&A forum.   

    Based on your description, your colleague selects the invitation link to join your Microsoft To Do list and receives the message: “Can’t join list. It looks like this list isn’t available. Try contacting the person who invited you.” I appreciate that you already reviewed Manage access and confirmed both accounts belong to the same organization. 

    This can occur when the invitation is opened with the wrong sign‑in context, when prerequisites for Microsoft To Do are not met, or when the sharing link references a list that is no longer valid. Microsoft To Do supports sharing only between personal accounts or between work or school accounts in the same organization; it also requires To Do to be enabled and an Exchange Online mailbox for both participants. 

    Below are some alternative steps designed to address your situation effectively:  

    1/ Begin by ensuring you are using the correct work account context 

    • Sign out of To Do and any browsers, sign back in only with your work account, then open the invitation from Microsoft To Do on the web and select Join.  
    • This ensures you join from the right organization account.  

    For your reference: Why can't I join a shared list? - Microsoft Support 

    2/ Proceed by providing and utilizing a refreshed invitation link 

    • In To Do, open the list → Share → Manage access → Create invitation link, then share the new link and join from the web as above.  
    • Older links can be stale, and deleted lists show the same message.  

    3/ Then, confirm all prerequisites in the admin center 

    4/ After that, check how the list was created and shared 

    • If the list was created in a personal Microsoft account and shared to a work account, recreate the list in your work account and share it internally.  
    • Cross‑sharing from consumer to work accounts was retired and joining is blocked. 

    5/ As your account is managed by your organization, please contact your IT administrator to check your permission and policies. For a more efficient resolution, we recommend using your administrator account or contacting your IT administrator to submit a support request directly to Microsoft Support team.      

    They can raise a support ticket by visiting: Get support - Microsoft 365 admin | Microsoft Learn   

    As community moderators, we appreciate your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have visibility into deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.    

    I hope this information is helpful. Please follow these steps and let me know if it works for you. If you have any updates regarding the issue, please feel free to share them with me.      

    Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.     

    I look forward to continuing the conversation. Best wishes to you and your family for a wonderful and prosperous New Year. 

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".    

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

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