Our Identity Service Provider has now resolved the issue and our Management API is now able to do authentication without issues.

Message from our Identity Service provider:

"Between 09:13 and 10:09 UTC on 16 Mar 2022, a subset of end users of customers using Azure Active Directory B2C may have experienced failures and error notifications when attempting to authenticate. Retry attempts were likely to succeed during this incident. This issue is now mitigated."

Our Identity Service provider has acknowledged that they are currently expiring issues: https://status.azure.com/en-gb/status

Some users reports intermittent issues with authentication when using our Management App. Our team is looking into the issue and monitoring the connection to our identity provider.