Hello! I’ve recently messed with two Holtek devices, so I have a little experience. Here are my first two observations:
The FCC ID indicates that your remote is supposed to operate in the 286-320 MHz range (https://fccid.io/MMORC0196M), not in the 900Mhz as shown in your picture. I’ve found that when using the frequency analyzer, these devices tend to get detected up in that range (harmonic), rather than their actual operating range. So that would be the first thing I’d try. Use the Flipper in Read mode and start with 300Mhz and try to get reads from your remote, working up the range. I would anticipate you’re going to get readings around 310Mhz or 315Mhz, probably.
The second thing that might happen, is that your remote might not sit quite in the frequencies that the Flipper reads/sends by default. There is a workaround for this, but for now, see if you can get a solid reading in the 300Mhz range first.