After Updating the GPO forcefully replicate the GPO Across All DCs
If you have updated the GPO and in the middle of doing testing. Then you may need to wait for replication and sync to finish across the all domain controllers in windows infrastructure environment.
To by pass this use the below command to manually force the Sync and replication.
Open command prompt with Administrator privilege.
Run the below command and wait until finish.
Repadmin /syncall /AdePq
Note: Command parameters are case sensitive.