In version 1710 (9.0.2.2279) of Dynamics 365 Online we get this dialog to create a new app… As you can see it contains the Client options Web and Unified Interface. After an automatic minor update to the newer version 1710 (9.1.0.33) online you only have this dialog available. This version creates a unified interface app by default and you cannot create apps with a web interface anymore. Microsoft is transitioning from the classic web interface to the relatively new unified interface. Is this the version where we cannot create new web interface based apps anymore? Either this is a bug or we face the next wave mentioned in Steve Mordue’s article: https://stevemordue.com/the-transition-to-unified-interface/
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