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Issue when syncing users to Office365


Im having some problems with the Azure AD Connect.
Today i synced the last users for my organization.

All other sync has been working flawlessly, except for this one.
Im getting the error: "AttributeValueMustBeUnique"

The attribute thats having a conflict is the "ProxyAddresses"
I checked the user thats getting the error, and he did have a value in ProxyAddresses that i removed.

If i try to resync, im getting the same errror.
What can i do to resolve this problem?
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Resolved this by demoting the user to a standard user, as i couldnt sync this when he was Global Admin.