Hello @userF7nJhX2vi6 ,
You have deregistered from the beta program hence are unable to update to official software. After deregistering from the program, only way to update to One UI 4 is to downgrade to Android 11 with smart switch on PC first and then take official update to One UI 4 software.
Please back up all your data before downgrade as process erases all data on the device.
If you need assistance having your software rolled back to the latest approved version you can call us at 1-800-726-7864 and request the location to the nearest Service Center.
One UI Beta Team