How to install a CA’s root certificate on a tvOS device

I would like to be able to install our Smoothwall https inspection certification on our Apple TVs. This is to ensure that we can decrypt and inspect websites like YouTube.

I tried this:

https://developer.apple.com/library/archive/qa/qa1948/_index.html

To install a CA’s root certificate on a tvOS device or simulator, do the following:

1. Put the .cer file containing the root certificate on a web server
2. Navigate to Settings > General > Privacy and select Share Apple TV Analytics
3. Press the Play/Pause button on the remote; this brings up a screen that lists the installed profiles along with an Add Profile option at the top
4. Choose Add Profile
5. Enter the URL of the profile and follow the on-screen instructions to complete the install process

But step 3 did not bring up profiles. It brought up all the Apple TVs on our network.

Any ideas?