Run automated integration tests

I'm in the process of migrating a application from `Azure B2C` to `Microsoft Entra External ID`.

Within the `Microsoft Identity platform`, there is a authentication flow `Resource Owner Password Credential Grant (ROPC) ` for running integration tests (https://learn.microsoft.com/en-us/entra/identity-platform/test-automate-integration-testing?tabs=dotnet).

I've tried changing the configuration to work with `ciam`, but this failed.
The `External ID `documentation section has a similar structure as the `Microsoft Identity platform` documentation. But the chapter on `ROPC `is missing. Is this flow not supported yet? Are there any plans on adding it? Is an alternative flow available?
https://learn.microsoft.com/en-us/entra/external-id/customers/azure-rest-api-operations-tenant-management