Hi Peter Ivers,
I hope you are doing well.
I'd love to help you understand your situation better.
When you invited a guest user, they will receive an email invitation to access an organization's Microsoft 365 resources (such as Teams, SharePoint, or OneDrive), they should follow the steps below to accept the invitation and gain access as a guest user.
Your guest have to find and open the email invatation.
The email invitation may look similar to this
Click the "Accept invitation" button.
This will redirect them to a Microsoft sign-in page.
If their email is already a Microsoft account, It will take them to Step 4
If it’s other provider, you will receive an access code via email.


They may be prompted to accept permissions requested by the organization (e.g., access their profile info).

Click Accept to proceed.
The organization may require Multi-Factor Authentication to protect access: They’ll be prompted to set up MFA using an authentication method.
Follow the on-screen instructions to complete MFA enrollment.

They’ll only need to do this the first time or when security settings change.
Once MFA is completed and the invitation is accepted, you will be redirected to the resource you were invited to (e.g., a SharePoint site or a Teams workspace).
Note: If nothing assigned yet, The My Apps page opens, and you'll see the message "There are no apps to show."
This is where you should verify the guest account in your tenant by navigating to Microsoft 365 Admin Center > Users > Guest users > [Guest name] and confirm whether any access or resources have been assigned to the account yet.

Next, since your guest's email is already associated with a Microsoft 365 account, they will be directed to their own organization's login page to enter their password. Guest accounts use their own organization credentials. They does not have a password in your tenant. They must sign in using the credentials from their home organization (their own domain). This is why you are unable to reset their password, only their home tenant admin can manage it.
If the user cannot sign in, their IT administrator needs to verify that:
- The account exists in their directory
- The account is active and not blocked.
- The account can only be reset by them.
This responsibility falls under your guest’s IT administrator, as they manage the account in the home tenant. Since the issue originates from their environment rather than yours, there is no action you can take on your end to resolve it.
Their IT admin can find their account under Users > Active users in Microsoft 365 Admin Center or check sign-in logs via Entra Admin Center > Users > Sign-in logs.

Once the guest’s IT administrator has resolved the sign-in issue on their end, you can consider remove and re-invite the user to prevent any potential conflicts. In the meantime, please ensure that the appropriate access is configured by assigning them to the correct groups and granting the necessary resources so they can view content within your tenant.
I hope this provides enough clarity and helps you stay inform with your current situation.
In the meantime, if you see my replies bring helpful information, please kindly accept it as an answer and vote it up by your original account, which raised this question. Once marked, it will automatically pin to top. As other users will also search information in this community, your valuable vote up will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.
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.
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