Project Web task assignment email error for guest users #EXT#

Don Nguyen 0 Reputation points

We are using Project web for over 6 months and recently got an error on email delivery when assign a task to a guest user. I did some digging and it looks like the Guest User from Office 365 has 2 fields. Email and Email Address. The Email Address field has correct email of the guest user while the Email field was generated from the system with the "#EXT#" added to the middle. The notification email is generated using the Email field which contains the invalid email address so we got Office 365 error: "Your message to couldn't be delivered". I tried to delete and re add the guest user but the system keeps generate this wrong email. This email notification has been working fine for several months until the last 3 weeks. We rely heavy on this feature to assign tasks to our guest users. Please help!



Microsoft Office Online Server
Microsoft Office Online Server
Microsoft on-premises server product that runs Office Online. Previously known as Office Web Apps Server.
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  1. Emi Zhang-MSFT 21,626 Reputation points Microsoft Vendor


    I suggest you post this issue to Project forum:

    The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.

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