License Key attached to different account, cannot activate purchased key?

I've replied to your message Avinash. Still need assistance. Thanks!

 

I'm experiencing the same issue when trying to transfer my valid Parallels Desktop license to a new Mac.

I have a legitimate license key for Parallels Desktop (version 18), which I purchased and activated on my previous Mac under my own Parallels account.
Now I'm trying to activate the same license on a new Mac. When I attempt this, I receive the following messages:

"This license is already used to activate Parallels Desktop on another Mac..." - I understand and agree that activation on the new Mac will deactivate the old one.

However, after clicking "Activate on This Mac", I receive the error:
"This license key is associated with another Parallels account. Please sign in using this account and try again."

Can anyone help me?