IanClark
Hey, I had the same problem. I was able to set glyph ringtones but couldnt set glyph message tones.
You can try the solution given above by the Mod, but as per the solution, I didn’t see all my friends’ names in the ‘notifications’ section under ‘app info’.
Here’s the workaround I found after doing some tinkering -
Go to settings -> Notifications -> Conversations ->
Here I found all iterations of my friend’s chat and changed the notifications to my specific glyph message tone. When I went back to WhatsApp, the Glyph message tone was automaticaly set for that Whatsapp chat.