Can't connet ipad in Keynote
I try to use iPad as remote controller to control Keynote presentation on Mac.
I follow all the steps in Use Keynote Remote to control your Keynote presentation - Apple Support, and I still can't link my Mac with iPad.
This is what I see, which shows that no device is found, while both Mac and iPad are connected to the same Wi-Fi.
On the other hand I am able to link Mac and iPad using Sidecar.
Please do not tell me to read the above instruction link and follow the steps because I have done it several times.
My iPad is iPad 6, using iPadOS 14.4. My Mac is MacBook Pro 2017 using macOS Big Sur. Keynote on iPad is version 10.3.9.