I have Firefox for Mac iOS, and want to turn on notifications for Microsoft Teams, but I do not want them to ever make sound. Like ever ever. I cannot figure out how to turn on banner notifications while keeping them quiet (they always appear in the top right, as requested, but make a dinging sound.) The notifications panel in my System Settings is grayed out, and isn't allowing me to make changes to it for some reason. How can I can allow notifications in Firefox while suppressing any and all sounds those notifications they make?