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Hi @Redacted
Thank you for posting your question in the Microsoft Q&A forum.
You're encountering the error: Selected user account does not exist in tenant... The account needs to be added as an external user in the tenant first. This typically happens when a OneDrive or SharePoint folder is shared with a non-Microsoft email address, but the tenant that owns the folder hasn't properly provisioned your account as a guest in their Microsoft Entra ID directory.
It’s possible to access without giving them a Microsoft email address, but the sender does need to adjust the way they shared the folder. Here are some options you can ask them to use:
-Re-share using “Anyone with the link”
This generates an anonymous link. No sign-in or Microsoft account needed, you just click and open.
-Use the one-time passcode method
If they share the folder using the “Specific people” setting and include your email, OneDrive should send a verification code to your inbox. You can use that code to sign in without a Microsoft account.
Note: This only works if OTP is enabled in their tenant settings. Otherwise, you’ll still see the error.
Reference: External or guest sharing in OneDrive, SharePoint, and Lists - Microsoft Support
-Add your email as a guest in their Entra ID
The sender can manually add your non-Microsoft email as a guest in their Microsoft Entra ID. They may follow this article to add your external account Quickstart: Add a guest user and send an invitation - Microsoft Entra External ID | Microsoft Learn
I hope this information is helpful.
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