If you are still experiencing problems, why not create a new Gmail account and password and start fresh?
Remove your Gmail account from the phone.
Factory reset the phone and use the new account credentials.
Since you call yourself a clinically paranoid software engineer....
Sigh. I covered this already. So I'll flesh it out with more detail.
It takes semi-heroic leaps of effort to get non-branded (direct from Samsung) phones to behave with Verizon via wifi calling. Some work out of the box. Most seem to not.
My local verizon store
owner had to use his Verizon tablet and go back and forth with my phone in order to get it to allow Verizon wifi calling. Multiple fails. And it's a matter of having a non-branded phone ask for branded software, that seems to at time assume other Verizon specific crap is in there first. I have to guess on that last part, because it's not something consistent.
Google and Apple phones do not have this problem, nor do Samsung phones on T-Mobile.
If you talk to a BestBuy guy
(almost always a bad idea) he'll point out that "they were told" that the entire point of a carrier branded phoned is to allow wifi calling. Samsung
themselves however, deny this. Verizon people on the phone tend to get
But it doesn't stop the plethora of problems you'll see online about this topic. Google it, if you want to get aggravated. And I was one of the folks with this problem. And after all of this, I
still cannot get icon badges to work with the phone and message icons.
So I'm not particularly psyched to factory reset the phone. And no, it's not appropriate for me to change my google login for this....that's teethed into everything.