duplicate returns sd error#16 021A

[lehaplay90]

when logging in to the server, it gives the error sd#16021a

[Vinyard]

Hi, welcome to the forums!

Please make sure you're always searching around our forums, Discord & wiki for the errors you receive before posting a support topic in this section.
You can find additional info about the error you're facing by reading a previous answer from our AC team that has been posted some time ago:

 

The advice provided there is still valid to current day.