SEPM - SQL Account Change Issue

Hi

I'm trying to change the DB user account from xxxx to yyyy. While running the management server configuration wizard, I got an error message as "While reconfiguring the Server, you are not allowed to change the credentials with which the database was created".

The permission for yyyyis the same of xxxx (Connect & Execute for the instance).

My account has the local admin account on SEPM server.

I have attached the screenshot of the message.