Ah, forgot to say - yesterday i tried also to create a new Firebase project, and setup it anew.
The same negative result.
Don, just a suggestion to you - try to setup also a new project, but document\screenshot each step, and use some test-project that can be published as the formal example, and without helper class, but just some abstract new collection and doc inside it.
And if it will also be successful (as you already did with your current FB project) - it will be useful for your paying customers. Now this one lib looks for me not fully ready to be paid for, since i am so stupid that could not setup and use.