@ubeing, I sent you an email with screenshots as you requested. I hope for your help 

How do you confirm the phone number? 
Site categorically refuses send OTP code. Tried all my numbers and numbers friends (even from other countries) - no result.
Write that sent OTP code but in the end it does not come. 
In profile settings in the "Contact number" I enter my phone number 814791****, choose "United States (1)," but when I click on the "Update" button disappear first two digits, and it looks like this
Maybe someone can explain what I'm doing wrong?