I have an older Samsung Galaxy Tab-E tablet running on Android 7 with the Yatse remote app installed, version 10.8.0
Pressing the power button in the Yatse app sends WoL and HTPC wakes up from its powered down state. Libreelec 19 on x86/64 machine.
I have a Samsung Galaxy A70 running Android 11 with the Yatse remote app installed version 10.8.5
Pressing the power button gives the same on screen text results but the HTPC doesn’t wake up.
All devices are on the same LAN with the same settings in the Yatse remote app and the phone and tablet on the same wifi router with it being 2.4GHz.
The only thing I use the tablet for now is to start the HTPC when I am too lazy to walk across the room.
If I had WoL running form my phone I could retire the tablet and repurpose it.