Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

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Posted on by Financial IT Guy

Hi everyone,

I am attempting to "Test and Enable" my mailbox in a new instance of Dynamics 365 CRM and I keep getting this error when it attempts the outbound:
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An unexpected error occurred while sending the email message "Your mailbox is now connected to Dynamics 365". Mailbox Financial IT GUY didn't synchronize. The owner of the associated email server profile Microsoft Exchange Online has been notified.

ActivityId: 673bb055-4b9a-4121-b01e-26669dc93410
>Error : Microsoft.Crm.CrmException: User does not have the privilege to act on behalf another user.
at Microsoft.Crm.BusinessEntities.SecurityLibrary.VerifyUser(Guid user, ExecutionContext context)
at Microsoft.Crm.BusinessEntities.ExecutionContext.SetCaller(Guid callerId, Boolean setCallerLanguage, Boolean verifyUser, Int32 callerLanguageCode, Guid previousCallerBusinessId)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Guid userId, Boolean startTransaction, IsolationLevel isolationLevel, ExecutionOperationContext operationContext, CallerOriginToken originToken)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Guid userId, Boolean startTransaction, IsolationLevel isolationLevel, ExecutionOperationContext operationContext)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Guid userId, Boolean startTransaction)
at Microsoft.Crm.Asynchronous.EmailConnector.S2SHelper.UpdateMetadataFor...

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Now here's the issue: I'm logged in as as System Admin and also am a Global Admin for my Tenant. I am attempting to Test and Enable my own mailbox. Is it really saying that I can't send an email on behalf of myself? Also, this is the first time this has happened and it's happening with every mailbox I try to enable, with any user, regardless of security role or admin status.

Any ideas?

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Customer Service

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Answers (1)

Sachin Dev Gupta on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

The issue in my trial instance got auto-resolved today. Maybe MS have applied hotfix overnight to resolve it.
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Financial IT Guy on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

Issue resolved after opening a ticket with Microsoft, finding out that there would be a hotfix applied and trying again after the hotfix.
Financial IT Guy on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

I'm logged in as a System Administrator and so the privilege is already assigned.
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ARIFNIIT 1,391 on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

Assign Privilege Act on behalf of another user to your user security role.
Sachin Dev Gupta on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

I am also getting the same error today. I have created a CRM trial instance last week and configured server side sync, mailbox, exchange and all that, with those settings Dynamics was processing emails on 12/05/2017, but when I tested today on the same mailbox, it didn't work. I am getting same error as what you mentioned.
Financial IT Guy on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

I do not see those options in my Email Server Profile screen...
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ARIFNIIT 1,391 on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

I am asking about incoming and outgoing connection credential. refer below screenshot
Financial IT Guy on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

I am looking at the Email Server Profile Configuration but there is no authentication listed anywhere. The owner is "System". Am I missing something here?
ARIFNIIT 1,391 on at

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RE: Setting up Server Side Synchronization with Exchange Online, get "User does not have the privilege to act on behalf another user" error

Please check email server profile configuration. I think authentication setting is running with a user credential who does not have permission on behalf of exchange folder.