intermittent issue in SharePoint for external user - Guest user is signing-in but external sharing is disabled

Question

Hi,

I have a SharePoint Online site which is used to share information, and provides a communication channel to a number of external users. There is a number of these sites set up for various customer companies and currently this issue is only occurring in one of these.

The external users are added into a security group into our azure ad and this security group is added to the members group in the related SharePoint. When using the check permissions function in SharePoint I can see that the affected users have edit permissions through membership of the members group.

The issue does not present itself continuously, rather they tend to only encounter the issue randomly during the day while actively engaging with the portal, for example when filtering a SharePoint list for information.

The prompt displayed through their browser is as follows.

After being presented with this error, the user can reload the SharePoint site, can authenticate and work as normal.

Answer 1

Hi Tina,

Issue persists in privacy setting as well.

I checked the list, and the rest of the site for any unique permissions, but they are all inherited from the parent. The user's group has edit permissions under the parent. Other members of this group have not been experiencing this issue either.

We've added the user in on another account and they're experiencing the same issue under the new account as well. This is odd as the only link between these two accounts experiencing the same issue is that the same user and the same phone are used for MFA as all other users are unaffected.

Both service incidents you referred to do not seem to apply here so I've raised a support ticket as per your advice. Thanks for your assistance, greatly appreciated.