API to access MS forms

I'm sorry, I don't know what you are asking. I know what a form owner ID is, what I was asking was, where/how was mpheasant deriving the value(s) before construction the query URL. A tenant ID is essentially a constant that can be discovered easily in the Azure Portal but form owner IDs are "user metadata" that accrue over time as new forms are created. In order to query against those forms one would have to collect them before hand.

Right now I am struggling with accessing anything I don't explicitly "own", even though I am a member of Approvals App Admin Team. Custom approval templates are actually forms and I need to be able to read their responses, which is why I am in this game. It's a specific case within the larger general case of reading form responses, which I still cannot do with C# and ConfidentialClientApplicationBuilder.