I can add and amend alarms on my S2 system.  Can you confirm if you’re running an S1 or S2 system?

S2

Are you getting an error message or is the Save button greyed out?

It says it is saved and then when you go back I go the app it has gone and all the old alarms are there. I tried deleting the old alarms and they do delete but then when you shut the app down and reopen they all reappear and any new ones are gone. 

I can’t reproduce that behaviour on my system.  Can you power down your devices for 5-10 secs and retest.  If this works, you may want to look at my post: 

I’ll try the red wine. Thanks