Users in organization A are guest/member of an o365 Group in organization B. User A opens organization B in the teams app on a Mac to access the team(where user A is guest). Then navigates to the selected channel and clicks "files" tab.
For a second files appear in the channel but disappears. - Files disappears, and messages occur:
"Cannot load the files, let's try again" (appears in the top right corner)
They see the folder/channel name but following message in the "files area" is displayed:
"This item might not exist or is no longer available"