Well, after refusing delivery and elevating things in several ways, I got the final answer. Powerwall credits are not available on the Model 3. Only Model S and X apparently. Bizarre, but I just want my car at this point so gave up.
I did email them with 4 zip codes that I could install my three Powerwalls and asked that they get them installed this year. I am sure my luck will be no better than here where they denied me the credits after verbally saying it was no issue.
I bet they are only installing the Powerwalls with folks that order solar at the same time and probably bury the freebie in their quote somewhere. Has anyone received their Signature Red Powerwall that hasn't bribed them with a solar install at the same time? Unfortunately, my home already has solar and my cabin is at nearly 10K feet in elevation with little sun exposure so solar is silly and would create issues with the snow.