You have reached the maximum number of activations available for your activation key. Please help

Just had to rebuild mac, and can't get past:
"You have reached the maximum number of activations available for your activation key"
Found a solution that says, log in to old mac, but motherboard is dead... PLEASE HELP!!!

 

Hi, your key has been reset, please check the issue.

 

I am having the same issue. Can I have my activation key reset, as well? Currently moving from an old computer to a new one, but still running the same version of macOS on the new one and need to reactivate Parallels.

 

Hi, I've made necessary changes with your key, please check the activation issue.