⚠️500 Server Error when trying to add a subdomain

On a rare occasion, the error code 500 may be thrown if the name of your subdomain was already used previously by a now terminated server. 
 There are 2 ways to fix this, 
 Number 1 being to use a different subdomain, 
 Number 2 is to open a support ticket, and ask for the domain to be deleted in the records because of the 500 server error.