Hi @Sem Anikin ,
I've had the same problem before. According to my experiment, in the EAC left panel, please locate compliance management>journal rules, check if the admin account in question is set as a Journaling mailbox in a journal rule. If yes, uncheck the rule or change the journaling mailbox to another mailbox instead and then try again.
Reference link: Journaling in Exchange Server | Microsoft Learn
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