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AbdulBasith-2983 avatar image
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AbdulBasith-2983 asked PenrodDan-3164 commented

There are multiple recipients matching the identity. please specify a unique value

Hi,

I'm getting below error when adding a user to O365 Distribution List in Specified Senders.

There are multiple recipients matching the identity. please specify a unique value.

I Checked the mentioned user is not duplicated or not having a same display name..
Also not any contact list as a same display name
And also this issue is persisting from the O365 Exchange Admin Center and can add the user from O365 Classic Admin Center.


office-exchange-server-administration
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michev avatar image
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michev answered PenrodDan-3164 commented

Using an alias/display name or any similar attribute is never a good idea. Best use unique-valued property such as the email address or UPN.

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I've been getting the same error message. It seems to work with some email addresses and not other. The issue is with a mail flow rule in both the new and the class Exchange Online Admin portal. The error message is pretty much useless. I've checked and doubled checked that there's no extra special characters or punctuation and it's a completely unique email address. I suspect it must have something to do with the email domain being listed somewhere else in some group of internal or external or partner email domains. I'm the Compliance DLP guy, not the Exchange admin guy... so I don't know where to begin to investigate this further.

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