Hi @ZeLin Zhu ,
Welcome to Q&A forum and thanks for your question! But please be aware that this forum is an English forum and we do not support Chinese threads.
Basically you could translate your question to English or post your issue on https://social.technet.microsoft.com/Forums/zh-CN/home?forum=exchangeserverzhchs, this is for our Chinese users and we could provide you a better service.
As for your question, please first check if you have the Disaster Recovery permission, it is contained in Organization Management role.
Then please provide the cmdlet you used.
Or try the following cmdlet:
New-MailboxRestoreRequest -SourceDatabase "MBD01" -SourceStoreMailbox "Mailbox" -TargetMailbox user@Company portal .com -AllowLegacyDNMismatch
Thanks for your understanding & have a good day!
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