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Guest users can participate in conversations, but cannot access files

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Frequent Contributor

One of our customers uses Microsoft Teams as their chat-based workspace. They can create teams, add channels, discuss in conversations and share files with each other, all within Microsoft Teams. Recently, they decided to start working with other companies using Microsoft Teams. However, after sharing a team, the guest user has only access to the team channels, switch between the tabs, and participate in conversations. The guest user cannot open files shared in a chat, he receives the error message "You don't have access to this file.". When the guest user switches to the Files tab, he cannot see any document, only the error message "You don't have access to these files". Opening the SharePoint site as the guest user results in the error message "You need permission to access this item". The SharePoint settings seem to support external sharing. Attach files provide screenshots from the guest user's Team environment, and the Teams / SharePoint sharing settings.

 

We were able to reproduce this error for new teams, for each invited guest. Steps to reproduce:

  1. Create a new team as an employee
  2. Add some documents as an employee
  3. Add guest user to the team
  4. Let guest user accept the invitation to join the team
  5. Let guest user sign in to Teams and let him open the team. Browsing the channels, the tabs and posting messages works
  6. Let guest user click on a document mentioned in a conversation, results in the file access-error message
  7. Let guest user click on the files tab, which results in the files access-error message
  8. Let guest user click on Open in SharePoint, which results in opening the browser with the error message "You need permission to access this item"

Any ideas on how to make collaboration with guest users working?

 

Guest user in Team-Conversations.pngGuest user in Team-Files tab You don't have access to these files.pngGuest user in Team-Open document from teams conversation.pngGuest user in Team-Open SharePoint site-You need permission to access this item.pngMicrosoft 365 Admin-Sharing settings.pngSharePoint Sharing settings.png

4 Replies
While I have seen this issue before, It could be just a question of time that SPO gets aware there are new guests users in the team...if the guest users were added some time ago, then this is not working as expected and you will have to open a support ticket in the tenant and if possible, share your ticket ID here so I can involve the right guys in this thread
Solution

We managed to get this working by changing the Office 365 Groups sharing settings. Below you can find the Office 365 Groups settings resulting in the issue and the changed settings which resolved the issue.

 

Office 365 Groups setting-before.pngOffice 365 Groups settings, resulting in the issueOffice 365 Groups setting-after.pngChanged Office 365 Groups settings, resolving the issue

I cannot find where these settings are to review and change them. If you can provide a path to the right settings it would be appreciated.
Thanks @Harold van de Kamp and @Juan Carlos González Martín 

This setting is in the admin portal! Services and add-ins -> groups

Adam
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