Apple Mail denies to add 9th email account in iPhone 11 pro
Referred device is iPhone 11 pro, iOS 15.3.1. I have already configured 11 Google email IDs. All corporate email accounts in google workspaces. But not sure want happened when I tried reconfiguring the email accounts. It allowed adding 8 email IDs and it denied to add any more email accounts. It prompted "You're signed in to the maximum number of accounts. To use another account, sign out of all Google accounts on this device.".
I tried signing out from all accounts and tried adding the email accounts again. It ended with the same result.
I have done enough web research without any luck.
Does anyone know a solution for the issue.