Hello @Sandler, Irena (Irena) ,
Thank you for reaching out to Microsoft QnA platform. I assume the error you receiving is expected. Graph URL https://graph.microsoft.us/ can be only used by Application deployed on US Government National Entra ID Tenant.
Documentation Link: https://learn.microsoft.com/en-us/graph/deployments
So, I assume the error you are receiving is expected if your application is hosted on a normal/commercial Entra ID tenant.
I hope this answer helps to resolve your issue. Please "Accept the answer" if the information helped you. This will help us and others in the community as well.