2 - Login to the account and change the email address. (Recommended Gmail, Yahoo, etc)
3 - Go to settings and change the country and time zone for yours.
4 - Click on this link https://www.fitbitionic.expertinquiry.com/ , choose your country, and wait
5 - Just complete all the forms, use your account name here, can be a random phone number!
6 - After you will receive a confirmation on your email like this (https://prnt.sc/jXBVi_1K8DW-)
7 - Now you need to wait like 1h and go to this link https://myhelp.fitbit.com/s/devicedisable
8 - Just Log in again in the account, put your reference number, and agree with all terms
9 - In like 10minutes to an hour you will receive an email confirming your refund!

USA ain't working, so choose another country from Europe like Spain, France, etc
For a better success rate, do this in the morning (London Time)
For more than 1 account use vpn!