How to connect a third party domain to Firebase hosting?

Question

firebase

Good afternoon!
There is a domain bought in reg.ru, there is a hosting on firebase.
What am I doing wrong?
I act according to the firebase instructions:
At the first step, I indicated the purchased domain,
At the second step, I inserted the data to confirm ownership from FB into regru
@ subdomain, TXT class, Address (copied Value into FB).
And for some reason FB refuses to confirm :(
What is the plan of action? How to make FB and REGru friends?
The time for activation is about a day...
It will take a lot of time to test it myself.
Thank you! :)

Answer 1

The answer is simple - they do not support :)
As I later found out, VKontakte also does not know how to punikod.
ps: github and somehow stole my domain :)