Attempting to setup a test tenant with access to Landis Attendant Console, and was getting errors around granting access to the tenant.
The error message I was receiving via the browser URL..
The app is trying to access a service 1fd5118e-2576-4263-8130-9503064c837a (Azure Communication Services) that your organization <GUID> lacks a service principal for.
To fix I needed to manually add the "Azure Communication Services", via PowerShell.
New-AzureADServicePrincipal -AppId "1fd5118e-2576-4263-8130-9503064c837a"
After waiting for about 3 mins, I was able to grant consent ant get access to Landis Attendant Console.