We are building an Sharepoint 2019 production farm and for the start we have a two-node SQL server cluster with Availability Group configured and apparently someone has installed SQL Server on those nodes with our test-farm SQLAdmin account and also set the SQL Server Services running with test-farm SQLService accounts.
I was able to login to those instances with the test-farm SQLAdmin account and then I just added new login for the prod-farm SQLAdmin with sysadmin rights, but I should also change the service accounts that are running the SQL Server Services to the prod-farm service accounts.
How this should be done in a SQL Server cluster with AvailabilityGroups configured?
This is just the initial setup so any data loss doesn't matter.


