That remote is intended for your TV2 (remote TV) output, but if you put the 622 into the "Single" mode then TV1 and TV2 are the same (TV1 is HD and TV2 is SD and down-converted HD) and either remote will control what you're seeing on both outputs. You can toggle between the "Single" and "Dual" modes with one of the front panel buttons. Check your User's Guide for the exact instructions.
Even then, if you have the 622 buried in a cabinet it still might not work with the UHF signals. Make sure you have the UHF antenna correctly installed and oriented on the receiver back. You might have to do some tricks to get more signal to that antenna, like relocate it.
Also - make sure your 622 is getting adequate ventillation !!! I can't stress this enough! This unit runs VERY hot and any high temp. condition is likely to lead to early failure and might even adversely affect your other equipment in that same cabinet!