Follow the steps below:
1) Remove devices from your online Bitdefender Central: https://www.bitdefender.com/consumer/support/answer/2795/
2) Visit online Bitdefender Central and install your Bitdefender product: https://www.bitdefender.com/consumer/support/answer/28558/
If the issue persists, kindly contact Bitdefender support by visiting https://www.bitdefender.com/consumer/support/help
Select, How to's & Troubleshooting Bitdefender products→Troubleshooting→I don't know→Contact Support→ You will get the option of chat, call or email.
Regards