This is the setting in the web version:
I have set Matrix up to use
jurf[m] as my IRC nickname, while using
Juraj Fiala in Matrix rooms, so I added ‘jurf’ to the keywords so I get proper notifications. This passes over to the mobile version too by the looks of it, because I get proper notifications there, but it doesn’t work in Fractal, so I only recieve notifications for Matrix rooms.