Andrey Ah, that’s protonmail, right? I’m afraid, Yandex will not accept email from there, sorry for that. I discussed that with their support in the past already. They just can’t, it is just banned in their juridiction. I guess every email hosting provider has it’s blind spots and list of banned counterpars due to sanctions and all that. For example, the mailing service that is used in this forum actually is capable of sending mails to you apparently, but gets regulartly rejected from some other services, such as gmx.de for example. It does not seem there is any perfect solution that fits all requrements, unfortunetely. We tried several sevices already, but still have not found any that would just work whithout any exceptions.
Anyway, I am sorry for that inconvenience. Please use any backup email address, for example gmail.