Resolution

Within SSMS, navigate to the AlwaysOn High Availability > Availability Groups
Right click the Availability Group you wish to failover and click Failover
On the Introduction screen, click Next
On the Select New Primary Replica screen, make sure the desire SQL server is listed and selected, then click Next
On the Connect to Replica screen, connect to the SQL instance if required, if not click Next
On the Summary screen, verify that everything is correct and click Finish

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