Hello
As I understand here, you are trying to stop master DB instance, please confirm? Please note that you must delete the master DB’s replicas first in order to stop master DB.
Moreover, If you are trying to add a user, create database etc. please note that such operations are not allowed from a read replica (failover instance). You can perform such operations from master DB. Though you can add authorisation IP from replica instance independently.
Please send me the text of message along with screenshots of failed operations as I believe you are trying to perform such operations from cloud console?
Hello
As I understand here, you are trying to stop master DB instance? Please note that you must delete the master DB’s replicas first in order to stop master DB.