It’s a slightly different approach now, but you can have as many notifications as you like for a given switch. Notifications should be set via routines, not via the device’s page.
Start with the routine and select the trigger for the notification. In the THEN section, select Control Devices and select the switch you want the notification on. In the following screen, select a setting for each of the four Notification items. Make sure you set all four. (By default, Turn On will also be selected. Press it to deselect it.)
Rinse and repeat for additional notifications on the same switch.
It’s actually much cleaner under Edge, but just approached differently. Most importantly, this accomplishes notifications without child items, which is beneficial if your device count is high.