That shouldn't be the problem, the suspension of activities on their platform due to the sanction are limited to the people residing in Russia and Belarus. Unless you can't provide a concrete evidence that you're accessing and currently residing in Bulgaria, the limitation shouldn't be applied to you.
What's the last thing they said to you regarding this matter?
I've provided them official contract of buying appartment I currently live in + contracts of selling previous appartments + bulgarian permanent resistence card + bulgarian driver licence + bulgarian bank account statement.
yesterday they asked me to provide the ownership of my another appartments in Sofia which I use in airb'n'b + my bulgarian firm bank account statement.
so, it's not enough for them to make sure of my place of residence, now they need to check where I get my money from.
ok, sending it.