I have configured "Always On" on SQL server 2017, and also created a backup maintenance job using the wizard, but when I executed the backup job I got following error:
Could not process the operation. Always On Availability Groups does not have permissions to access the Windows Server Failover Clustering (WSFC) cluster.
Disable and re-enable Always On Availability Groups by using the SQL Server Configuration Manager. Then, restart the SQL Server service, and retry current operation.
I disabled/enabled always on but still get the same error.