Hi @Mohamed Hamed ,
I don't have the tools to look up your correlation ID without a support plan open, but if you go to the portal and search App Registrations > Search the app with App ID d9f8cc5a-xxxx-xxxx-xxxx-xxxxxxxxxxx, you can confirm whether the Redirect URI listed is https://xxxx.xxxx.com/auth/microsoft_graph_auth/callback
For GCC High tenants, it's possible that there could also be an issue with the SSO context, for example if prompt=none in the Oauth request for the sign-in. If that is the case you may try adding prompt=login to the Oauth request for interactive sign-in.
The format of the URL in your app settings needs to be exactly the same as the one in your app registration, and there cannot be an extra space or slash. You also need to make sure that the tenant ID is the same in both places.
If you still face this error after checking these settings you can send me an email at AzCommunity@microsoft.com ("Attn: Marilee Turscak") and include your subscription ID and a link to this thread, and I will open a one-time free support case to look into your issue.
If the information helped you, please Accept the answer. This will help us as well as others in the community who may be researching similar errors.