When we use this API and send partial update for Primary Email (email) property it updates Username (login) too. Is there any way to update Primary Email without updating Username?
Hi @ruslan, thank you for posting your question on the devforum!
Can you check if your org has the flag SELF_SERVICE_REGISTRATION enabled? When that feature is enabled, we force Primary Email and Username to be the same.
We use preview account for testing. Looks like this feature is enabled there by default. I do not see any option to disable it in Okta Portal. We will double check out production account.
Based on Documentation: This is an Early Access feature. To enable it, please contact [Okta Support].
We did not contact support to enable it 
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