As far as I have just read through the correct specification to: HP OMEN 30L Desktop - GT13-0709nz... there are: HyperX® 16 GB DDR4-2933 XMP SDRAM (2 x 8 GB) installed. So if you want to upgrade to 32GB Ram... then this Ram won't fit.
If you have not already done so, you can adjust the RAM frequency in the UEFI (BIOS). Depending on the motherboard, press ESC, del or one of the function keys (F1, F2, F10, etc.) during start-up until you reach the setup mode.