IPad Pro will not connect to my Xs Max as a remote for Keynote

I think Keynote Remote as a separate app has gone. Instead you install Keynote on both devices, and use a remote function in one to control the other. See Use Keynote Remote on your iPhone, iPad, or iPod touch - Apple Support. Working here with an iPhone 6+ and iPad Pro. If you cannot get it to work as described there with your hardware use Feedback - Keynote - Apple to let Apple know.

tt2

Yeah,

That is not going to work.

You can't remote control iDevices with other iDevices.

Sorry.

Don't think so.

Not directly between iDevices.

Do you own an Apple TV?

What app are you using?

Maybe with Keynote on a Mac.

Not Keynote on iOS for iPad.

No way.

There is NO way to remote control an iPad from an iPhone.

I have NO clue how you have been doing this.