I would suggest you change the Email in Genesys FIRST before changing in AD. That way, SCIM should see that existing user and not try to create a new user based on the new Email in AD.
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Robert Wakefield-Carl
TTEC Digital, LLC dba Avtex
Contact Center Innovation Architect
https://www.Avtex.comhttps://RobertWC.Blogspot.com------------------------------