Hello @fjakhfjshafdagfasdf, welcome to the Sonos Community!
I am sorry to hear you are having an issue where you are unable to create/edit/delete alarms in the Sonos App with your iOS device.
Thank you for reporting this to us. We are investigating the issue and do not currently have an ETA on when this will be fixed.
The available workaround, as you mentioned, would be to temporarily use a different controller (Android/desktop) to do this.
I will make sure to reply here with an update, when I get one, and I hope this helps.