I need to add an A record for the subdomain mail of my domain. When I enter the IP address and want to save the entry I get this error message:
DNS Validation Error (Code: 1004): Content for A record is invalid. Must be a valid IPv4 address (Code: 9005)
The IP Address is definitely correct and is 18.104.22.168. I have setup the same entry for another domain also to this IP address and there it is working without problems.
What is the reason for the error message?
Greetings from Austria,