Multiple EUM addresses in proxyAddresses field is detected for the user %1. A user can have at most one EUM address in proxyAddresses ...

Multiple EUM addresses in proxyAddresses field is detected for the user %1. A user can have at most one EUM address in proxyAddresses field. EUM address of this user will not be replicated until this problem is fixed. 
The source of the replication is %2.

Resolution:
Delete extra EUM addresses in proxyAddresses field in AD for this user.
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