After you disable AlwaysOn Availability Groups, the instance of SQL Server must be restarted. SQL Configuration Manager restarts the server instance automatically. However, if you used the Disable-SqlAlwaysOn cmdlet, you will need to restart the server instance manually. All good here, but to add it happens in an opposite way when turning on AlwaysOn. PSH will do an automatic restart while through GUI it needs a mannual service restart.
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