Microsoft Authenticator for Apple Watch to be retired:

The Microsoft Authenticator app for Apple Watch joins a long list of third-party watchOS apps that have been discontinued over the last few years, either because of perceived redundancy or lack of user uptake. Other notable Apple Watch apps that have been discontinued include Twitter, Instagram, Target, Trello, Slack, Hulu, and Uber. Source: Microsoft Authenticator Discontinues Apple Watch App - MacRumors

There is a clear trend.