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you made no code changes to your pulumi program at all?

Actually I did add new AzureAD app registrations... and now that you mentioned it, I see that removing the additions causes the error to go away.

Usually I see this error when calling one of the delegate overloads to initiate your pulumi program, and also instantiating your own

Pulumi.Stack

in your program. There can only be 1

Pulumi.Stack

instance in any given pulumi program and the delegate overloads for running a pulumi program (instead of providing a TStackType) usually instantiate a stack for you so you can inadvertently end up with 2 being instantiated But if you're just adding app registrations than I'm not sure, may need more information

Ok I see the problem now. I was trying to run my new app registrations separately instead of merging the new registrations together.