Thank you for posting your question in Microsoft Q&A.
Looks like the user is trying to access a resource from the tenant which is user is not part of.
You can try the troubleshooting steps in below article,
If this doesn't solve the issue you we can work on this offline.
Please send us an email on azcommunity [at] microsoft [dot] com with Sub - Attn: Sandeg and following details in the email body:
Link to this thread/post
We can connect offline and discuss further on this.