Event ID - 236

Event Id236
DescriptionUnable to process custom recipient Name of custom recipient because target address SMTP:(user@company_name.com) has already been assigned to Address Book entry /o=DomainName/ou=Site/cn=Recipients/cn=user.
Event InformationAccording to Microsoft:
This problem occurs if you are importing a custom recipient that has an SMTP alias that already exists. When the same address already exists for the user you are importing, you cannot import the custom recipient.
Edit the .csv file and change the duplicate e-mail address for the specified custom recipient. Try the directory import operation again.
Reference LinksXADM: Importing Custom Recipient Logs Event ID 236

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