Hi,
It looks like I am falling over on the first hurdle of trying to setup a CMG.
I have setup a PAYG Azure Tenancy and when I go to Config Manager > Azure Services > Configure Azure Services and when I get to the point of creating the Web app and sign in to my Azure account I get the error "Failed to Create Client App".

In the SmsAdminUILog I can see this but not sure what it means because I am global admin on the tenancy:

Not sure if you will be able to see the screenshot so in plain text:
at Microsoft.ConfigurationManagement.AdminConsole.CloudServicesManagement.AAD.AADDataHandler.RetrieveTenantDetailsFromAzureLoginCredentials()\r\n[1, PID:3280][05/28/2021 09:19:01] :System.InvalidOperationException\r\nFailed to sign in to Azure.The remote server returned an error: (403) Forbidden.\r\n at Microsoft.ConfigurationManagement.AdminConsole.CloudServicesManagement.AAD.AADDataHandler.RetrieveTenantDetailsFromAzureLoginCredentials()at Microsoft.ConfigurationManagement.AdminConsole.CloudServicesManagement.Dialogs.AADAppDetailsDialog.SignIn_OnClick(Object sender, EventArgs e)\r\n
When I create the web and client apps manually in the tenancy they import OK but when going onto the next step of Creating the CMG I get the error "A valid Azure AD app is required".

Any help would be appreciated, the tenancy is in a vanilla state nothing has been changed apart from creating a deleting the apps.