I have a Power Automate flow with the "When Power Pages calls a flow" trigger. I've added it to my Power Page. It works fine with the default domain that is made. However, I have a custom domain that needs to be used instead of the default. When I try to run the flow from the custom domain, I get the following error:

When I look at the Network tab in Developer Tools, this is what I see:

How can I get the flow to run from the custom domain?