Adding New IP's Issue

Greetings! @tmoore helped me understand how to add new IP’s but not working for me.

Adding additional IP’s - Support and Discussion - CyberPanel Community

When I try to add a new listener using the other IP(s) (not main server IP), I get an error stating “This port is already in use”:

How to add additional IP’s using ports 80 and 443? Not sure how to proceed?

Thanks in advance for assistance.