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Thermostat control not working on v4.0.1-beta.2 #539

Description

@psantia01

Please provide as much detail as possible. It's helpful to include Home Assistant debug logs from this integration. Instructions for enabling debugging are available at https://github.com/pyalarmdotcom/alarmdotcom/wiki/How-to-Test-&-Debug#enable-code-debugging. (Alarmdotcom debug logs are verbose, so don't forget to disable debug logging when you're done!)

Describe the bug

On v4.0.1-beta.2 (HA Container, Core 2026.5.4), my thermostat shows the correct current temperature and target temp in Home Assistant, and it picks up changes I make on the Alarm.com website. But changing the mode or setpoint from Home Assistant does nothing — the mode buttons don't respond and a new setpoint reverts to the previous value on the next refresh. The same Alarm.com login controls the thermostat fine directly on the website, so it's not a permissions issue. Lights and alarm arming/disarming work fine in HA. Rolling back to 3.0.15 isn't an option because lights don't appear in that version.

To Reproduce
Steps to reproduce the behavior:

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  2. Click on '....'
  3. Scroll down to '....'
  4. See error

Expected behavior
I would expect if I change the temperature or the fan state, it should take and work. The screenshot shows I've tried to lower the temp to start the air conditioner, but it's just not starting. I have tried everything and have used Claude also to help me. Just FYI...the alarm.com integration controls the lights, so that's all good. I haven't tried the alarm panel yet, but will to make sure more than just lights are working.
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Home Assistant Version:
core-2026.5.4 (Home Assistant Container, via Docker on a Raspberry Pi).
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