Cannot Join Availability Group [exclusive] Download Configuration Timeout 47106 [TESTED]

The SQL Server error , accompanied by the message "Cannot join availability group. Download configuration timeout," typically occurs during the final step of adding a secondary replica to an Always On Availability Group (AG). This error signifies that the secondary instance attempted to connect to the primary replica to retrieve AG configuration data but failed to do so within the allotted timeframe. Common Root Causes SQL 2017 AOAG setup on Standalone servers