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Hi @Vlad Ushakov ,
Welcome to Microsoft Q&A!
The tag “Microsoft Exchange Online” is for general questions related to Exchange Online. Since from the description your issue is about the hotmail.com account which is currently not supported in Q&A, it’s recommended to post in the following dedicated forum for hotmail/outlook.com instead.
https://answers.microsoft.com/en-us/outlook_com/forum/outlk_com
Thanks for your understanding and hope your issue can be resolved soon.
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