Both within the documentation and within the Power Platform Admin Center under Security > Identity and access > IP firewall > Environments (select my environment) > Set up IP firewall > Advanced > Reverse proxy IP addresses, it says you can add multiple IP addresses or CIDR ranges separated by comma to the Reverse proxy IP addresses field. However, if you enter more than one you received the error: "The IP address entered is invalid. Enter valid IP addresses separated by commas." I opened a ticket with MS support, and they said the documentation and portal are incorrect and that only a single IP or CIDR range is supported. Please fix this. Most WAF services have many CIDR ranges, so it would be nice to enter more than one. If not, please fix the portal and documentation. Additionally, we use Azure Front Door, but that isn't even an option in the service tags, which would also be nice to use.