KB Issue
SQL Server High Availability Group may not be able to be brought online or taken offline by the service.
Issue Details
When working with SQL Server High Availability Group, we may sometimes run into the issue where the service is unable to either bring the group online or offline.
This error can occur when the group is not configured correctly or when the files have become corrupted.
Recreate Issue
Hard to recreate a scenario where this error will happen.
I know in my case, I'd been trying for hours to get the SQL Server High Availability Group to work, but it wouldn't function properly. This could have caused some file or data corruption, as most of the databases on the secondary SQL instance, were reporting data loss.
Resolve Issue
    Step #1: Go to Active Directory Users and Computers.
  1. Choose [Computers]
  2. Search for the computer named [SQLGroup] (Or the name you gave the group)
  3. Right-Click and [Delete]
    4. Step #2:
  4. Open the [Choose [[Forward Lookup Zones : Keyword Tag | " itemscope itemtype="https://schema.org">DNS Service][/b] running on the DC (Domain Controller)
  5. Choose [[Forward Lookup ZonesChoose [[Forward Lookup Zones" />]
  6. Search for the Availability Listener [SQLListener] (in our case)
  7. Right-click, [Delete]
  8. Repeat the process for [Reverse Lookup Zones]
    9. Step #3:
  9. Go back inside [SSMS] (SQL Server Management Studio)
  10. Right-Click and [Delete] the newly created Availability Group [SQLGroup]
  11. Start the [Always On High Availability] Wizard.
  12. The wizard should now be complete.