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Ikram Momin 16Ikram Momin 16 

Changing User Type from High Volume Portal to New ICS Support Agents is not allowed. Select a different profile.

When will i get below error response from salesfoce :
Changing User Type from High Volume Portal to New ICS Support Agents is not allowed. Select a different profile.

which update operation could give above error?
AnudeepAnudeep (Salesforce Developers) 
Hi Ikram,

Guess we need to check the eligibility

https://help.salesforce.com/articleView?id=networks_license_upgrade_eligible.htm&type=5

Have you created a support case already?