I installed everything as the guide, so HACS, restart, Integration, then the card.
The card is displaying fine, I can select my switches, lights, etc…, but when clicking the Save button I get the error that the scheduler/add service does not exist!
For me now everything looks perfect. Looks perfect because the card with the functionality is there, but it doesn’t fire the action. The switch doesn’t turn on nor off while with a normal on/off button it does. For now I haven’t figured out what goes wrong…
You seem to be unlucky, but I’m sure we can improve things for you.
The screenshot you shared is helpful, but could you also share a screenshot of the entity registry in HA showing the switch.schedule_xxxxxx entities?
They should hold all the info related to the action that will be executed when the timer expires.
Btw: there is also a scheduler.test service, which you could use to test the action (simulating the firing of the timer). Perhaps it’s worth a try?
Ofcourse something could be wrong with the switch devices themselves, but I assume this is not the case.
And to be 100% clear: all your schedules should have their toggle switch to ON, or they will not do anything.
So what I did last night a made a small test setup with a sonoff switch. A normal button card to test the switch (it works flawlessly) and the scheduler card with a schedule. As said the switch doesn’t fire on schedule (btw I have rebooted and refreshed a lot ). Herewith the setup and the foto you asked for: