If you're having trouble activating your 3CX license key, you may be seeing an error similar to this:
"License Key Activation Failed License:18 System:12029"
If you see an error like this, make sure to check which email addres you're trying to activate your key with. You cannot activate your key with the same email address used in your 3CX Partner Portal.
You will need to use your customer's email address to activate the license key. Use a different email address, then try activating your key again, you should be able to activate without any errors.