Sharing issues with Sharepoint Online when the other Org also uses SharePoint Online

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Occasional Visitor

Our company's Project Managers often share files with our clients with SharePoint Online, but inevitably, when that client also uses M365, their users will report, after a short while, errors in sharing. Example of errors:
-when uploading a document "Sorry, there was a problem uploading this file. Please try again". 
-when logging in "Sorry, another account from your organization is already signed in on this computer"
-"We couldn't open that location. It might not exist or you might not have permission to open it"

The second error seems to point out the issue: it's a conflict between their M365 currently logged in credentials and the credentials on our SharePoint shared files/folders.

My question is, what is the right way to handle this? Please help!

1 Reply
Hello,

Based on experience when having external access enabled, i always try to group users with groups instead of giving direct permissions on single items.
I would suggest creating a seperate space, where permissions are delivered via groups and are not unique and giving site-wide access(read-only).
The above approach really handles well.