Phishing - Custom Domain (EU)

Hey Everyone, 

I have been trying to configure my own custom phishing domain using the guidelines - 

Create a new CNAME record and configuring its value as support-eu.lionnets.com .

Sadly, the domain still is not being validated. The only way I was able to accomplish validation, is if I forward the domain <302 Temporary / 301 Permanently) to cymulate.com.. But then I am getting cerificate errors :#

Would you please guide us how to use custom phishing domain - with - my domain’s own certificate?

Cause currently, using Login-Page phishing, has 0 merits.

Thank you.