If you cannot find the right combo in Homey Bridge own built‑in database, the easiest next step is a Broadlink mini 3. It can learn commands from the original remote and then you can include them in your flows. Works great.
Hassle free:
In order to just copy and use the IR remote signals right away:
I would buy a Broadlink unit right away: it’s very straightforward to learn signals
AND it works fully local, as opposed to the bridge.
I own a RM3 mini.
If you haven’t got a life
Can I assume the bridge is connected to a Homey Cloud instance?
If so,
Did you try the internal IR remotes dbase?
You have to be a bit lucky for the matching signal(s) to be present: