Hunter 99123 remote control dimming feature stopped working
I found an Amazon Review that might solve your problem.  The important part is towards the end of the review:

My guess was that having the CFL bulbs installed when the remote receiver initially powered up caused it to automatically disable the dimmer feature, as explained in the instructions. I suspected this meant some manual operation was needed to restore that feature after replacing the CFLs, but the instructions and Hunter website were both mute on the subject.
Then I remembered a section in the instructions that explained how to deal with &quot;flashing CFL bulbs&quot;, and that mine flashed when first powered up. The instructions said to use the remote to turn the lights off, then on, then hold down the &quot;fan off&quot; button while pressing and releasing the light button twice. I wondered if this might be the &quot;dimmer reset&quot; feature I was looking for, so I tried it. No joy, but the instructions said to do this repeatedly until the CFL flashing stopped so I tried it again. Viola! The dimmer suddenly worked.
If you have the same problem, don't waste your time with the Hunter support zombies, their inadequate instructions or website. Just do this instead.

This review comes from the Amazon Product that the OP linked, and was from user &quot;Sapient Hetero&quot;.  It is currently the &quot;top ranked&quot; review, but that could obviously change.
Also, it's possible that the dimmer wasn't made to support LED lights or support the particular lights you have installed even if it does support other LED lighs.