Unable to access a Microsoft To Do list invitation

Evans Molly 0 Reputation points
2026-08-14T06:09:24.01+00:00

Good afternoon,

We are trying to invite users to join a Microsoft To Do list by sending them invitation links via email. However, whenever they click the invitation link, they receive the following message:

"You cannot join the list. It appears this list is unavailable. Please contact the person who invited you."We have tested the invitation with multiple email accounts, but all of them encounter the same error and are unable to join the list. Could you please help us understand why the invitation link is not working and advise on how to resolve this issue so that invited users can access the shared To Do list?

Microsoft 365 and Office | Microsoft To Do | For business
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  1. Helen Luu 2,785 Reputation points Independent Advisor
    2026-08-14T11:28:30.99+00:00

    Hello Evans Molly,

    Based on the information you provided, I understand that you are attempting to share a Microsoft To Do list, but when users access the shared link, they receive a message indicating that the list is unavailable. This issue occurs for all users with whom the list has been shared.

    To help narrow down the cause, could you please check the following:

    1. Test access with another shared list
      • Ask another user in your organization to create a new list and share it with you.
      • Please confirm whether you are able to access that shared list successfully.
    2. Verify the sharing link
      • Go to Share and review the sharing link to ensure it is correct.
      • Please note that if Manage access > Limit access to current members is enabled and then disabled, the existing sharing link will be reset.
      • Please compare the value after: https://to-do.microsoft.com/tasks/sharing?InvitationToken= and verify that the link being used matches the current sharing link.
    3. Create a test list
      • Create a new test list and share it with the affected users.
      • Check whether they can access the new shared list without encountering any errors.

    Please perform the above checks and let me know the results so that I can narrow down the issue easier.

    I look forward to hearing from you.

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  2. AI answer

    2026-08-14T06:09:42.83+00:00

    For Microsoft To Do, this error usually occurs in these supported cases:

    1. The list was deleted before the recipient joined it. In that case, the recipient will see a message telling them to contact the person who shared the list.
    2. The list owner uses a work or school account, and the invited user is outside that same work or education organization. Microsoft To Do list sharing for work or school accounts is supported only between accounts within the same place of work or education.
    3. The invited person does not connect with a Microsoft account when using a shared list link. For shared task lists, only people who have a Microsoft account can connect to the shared list.
    4. There may be an ongoing service issue. A documented Microsoft Q&A case reports the same “can’t join list / list isn’t available” behavior as part of an ongoing incident, with admins able to review details in the Microsoft 365 Admin Center under issue ID MO1213801.

    Recommended checks:

    1. Confirm the list still exists and is still being shared.
      • In To Do in Outlook on the web or Outlook.com, right-click the task list.
      • Select Sharing options.
      • If needed, create a fresh invitation link.
    2. Verify the recipients are using supported account types.
      • If the list owner is using a work or school account, recipients must be in the same organization.
      • If sharing more broadly, recipients must sign in with a Microsoft account to connect to the shared list.
    3. If all tested accounts fail, ask the Microsoft 365 admin to check the Microsoft 365 Admin Center for a current service incident affecting Microsoft To Do sharing, including MO1213801.

    If the invited users are outside the organization of a work or school account owner, that sharing scenario is not supported in Microsoft To Do.

    References:

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

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