Multi Device support for Huntsman V3 Mini Hyperspeed + DeathAdder V2 X Hyperspeed

Hi! I recently purchased a Huntsman Mini v3 Hyperspeed and a DeathAdder v2 X Hyperspeed under the impression that they both supported multi device via one dongle. The firmware updaters for the Huntsman Mini doesn't update the firmware, same goes for the DeathAdder V2 firmware updater (it seems there's no Mini V3 or DeathAdder V2 X Hyperspeed firmware updaters specifically). If I try using the multi-device utility it either chooses to pair a house (when the mouse dongle is plugged in), or a keyboard (when the keyboard dongle is plugged in). I'm quite perplexed! I've also tried looking for the pairing utility option via Synapse, to no luck! Any ideas?