Cannot activate Fitbit Pay on Fitbit Sense

[PureEvil]

I did a factory reset of a (black) Fitbit Sense.  Upon resetting it, it gave me a cryptic message on the screen:

I had already removed the Fitbit from my account, but upon trying to pair it again, I got this error:

Then I tried to set up Fitbit Pay on my Samsung Galaxy S21 Ultra phone, where I got this error:

I spent some time with Fitbit support chat... Twice.  Where they had me try a number of things with my tracker and my phone.  I was told that they escalated, should expect an e-mail response, and the chat was abruptly terminated...  Twice.  That was over a week ago, I've yet to receive an e-mail response.

However, I was able to diagnose this further by using another (silver) Fitbit Sense and a different phone.

• Silver Sense/S10 E: Works
• Silver Sense/S21 Ultra: Works
• Black Sense/S10 E: Fails
• Black Sense/S21 Ultra: Fails

Yes, I have screenshots for all of the above.  The silver Fitbit Sense consistently sets up independent of which phone I use.  The black Fitbit Sense consistently fails to set up independent of which phone I use.  Everything indicates that it's a defective Fitbit Sense tracker.

Can anyone suggest a way to get the (black) Fitbit Sense correctly working with Fitbit Pay?  Ordinarily, I'd do a factory reset, but this is precisely what is failing.

Does anyone know how to get better traction from the support team?

Thanks in advance.

[DramaQueenDiva]

Good to see you again, @PureEvil !

Do you happen to know if your bank is supported by Fitbit Pay?  At what point in the setup process do you get the above screenshots?