Domain Disconnected from Yandex Mail

For our one domain there is problem on our yandex mail service. Domain is disconnected from there without our permission. Could any automatic change in cloudflare cause that problem? We need to solve that issue because we lost our mailboxes which have 5 year history. We also have cloudflare and yandex mail connection nearly for all our domains added here. Please help for us to enlighten that issue, it is crucial for us. Thanks for your help and time.

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