I invited a Microsoft to-do list, but the other party couldn't join

Turner Maeve 0 Reputation points
2026-08-16T11:15:23.2133333+00:00

Your company is using Microsoft 365 and Office.

I see the todo invitation link, but I ask the other party

It only says that you cannot join the list.

A notification appears that the other party has joined, but it does not appear to be a participant.

I am using the same account given by the company, so it doesn't seem to be a problem with the difference between my account and mine.

Microsoft 365 and Office | Microsoft To Do | For business
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  1. Teddie Dang 1,185 Reputation points Independent Advisor
    2026-08-16T12:26:19.2+00:00

    Hi @Turner Maeve

    I was unable to reproduce the issue on my side.

    First, could you please check the shared list in Microsoft To Do on the web after the affected user accepts the invitation?

    • Sign in to Microsoft To Do on the web with the account that created the list.
    • Open the shared list and check the Shared/participant information.
    • Confirm whether the affected user appears as a participant, even though you received a notification that they joined.

    If the user does not appear there, please let me know. Then you can try the following:

    • Create a new test list and share it with the affected user.
    • Remove and re-invite the affected user to the existing list.
    • Share the list with another user to check whether the same issue occurs or only affects this particular user.

    This should help determine whether the issue is specific to the user or the list.

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

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  2. AI answer

    2026-08-16T11:15:38.72+00:00

    For Microsoft To Do in a work or school environment, shared lists only work between accounts within the same place of work or education. If both accounts are in the same organization and the invite still shows "can't join list" while a false join notification appears, the supported causes and actions are:

    1. Confirm the list was not deleted or access was not limited
      • In To Do or Outlook on the web, open the shared list.
      • Open Sharing options or Manage access.
      • Check whether sharing was turned off, or Limit access to current members was enabled. If so, the old invitation link will no longer work.
      • If needed, stop sharing and create a new invitation link.
    2. Recreate the invitation if the original invite is stale
      • If the recipient appears as already invited but cannot join, remove the existing share/invite and create a new one.
    3. Verify both users are using the correct account type
      • Microsoft services sign users in based on the account type. A work or school account must be used for the business service.
      • Personal Microsoft accounts and work or school accounts do not synchronize, and using the wrong account can cause sign-in or access errors.
    4. Check whether the account is supported for Microsoft To Do
      • For work or school use, Microsoft To Do requires a supported Microsoft 365 plan and an Exchange Online mailbox for storage and sync.
      • If the account is incompatible, disabled for To Do, or uses only on-premises Exchange without a cloud mailbox, the user will not be able to use To Do correctly. In that case, the IT admin must verify licensing and mailbox setup.
    5. If only some users are affected, this may be a known service issue
      • Microsoft Q&A reports the same symptom: users receive "Can't join list. It looks like this list isn't available" and the owner may see a join notification even though the user is not added.
      • In the cited case, Microsoft identified it as an ongoing incident and advised admins to check the Microsoft 365 Admin Center service health for issue ID MO1213801.

    If both users are in the same organization, using the correct work account, and a newly generated link still fails, the next step is for the Microsoft 365 admin to check:

    • that Microsoft To Do is enabled for the affected user,
    • that the user has a supported license,
    • that the user has an Exchange Online mailbox,
    • and whether there is an active service incident affecting shared To Do lists.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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