When I use my mouse dongle pairing my mouse(DeathAdder V3 Pro) and my keyboard(BlackWidow V3 Hyperspeed), I can not control the lighting of my keyboard. If I use each device's dongle separately then each device works fine. I have never seen this problem in Synapse 3. It seems like I am not alone.

I have the same issue, it was working fine on Synapse 3! So frustrating. My keyboard dongle has connection issues as well, but worked great with multi-device pairing on Synapse 3 with my mouse dongle. Please fix!

Multi-device pairing bug

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Multi-device pairing bug

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