Aleksandar, thank you for the prompt reply. Yes, I got electronoc copies of the forms. But the issue is that electronic forms could be accepted by Belarus tax authorities only in case they are published at the Upwork web-site (you see a number of likes on my initial question post). Thus all freelancers from Belarus need the IRS Forms 6166 to be published to have a proof that they are not a fake.
Also I beleive it would be mutually beneficial as Upwork support will need to proceed less requests from Belarus freelancers.
We still don't have any updates on the form being published on the website. Once we do, we'll make sure to post it here in the Community.
but it was a little misunderstanding. I need the doc for 2021 year. I replied in my support ticket about it but not sure how support ticket works. Probably I need one more ticket.