Newbie - S61 mk3 - can preview sounds via keyboard dial but no sound from keys

Since it is Apple USB-C cables you are writing about then one would think that the cable that you write about would be a 'Thunderbolt' cable. But another user that had a cable problem has reported that a 'passive' Thunderbolt 4 cable worked where the cable supplied with the keyboard did not !

As for electronics then I think that how things behave might depend on e.g. if the device supplying power can keep supplying the correct voltage or not at a certain load (current demanded) and another factor can be the wire resistance of the cable used. And as for devices (in this case computers) then I imagine that it is not certain that ports on both computers behave in the same manner and not even certain that they keep supplied voltage at exactly same level at e.g. zero load or that the ports are both able to supply same voltage and/or current at a given load ! And as for cables then I am not sure at which voltage that USB-C communicates but a combination of specific computer port , keyboard and cable could do that the keyboard is not able to communicate with the computer because keyboard demanding more than computer port can supply using a given cable. And if so, then that could also be why you experience that one device works where another does not, because either the device working demands less or it is less sensitive to drops in voltage or current.. Or could be that for some reason one part haves a problem with frequency of communication, used communication protocol or whatever. Of course all this I just my imagination and stray thoughts on the subject and despite interest in electronics then I do not know sufficient about the subject and I am not a hardware engineer..

A lot of people have had a lot of problems with cables and USB-C PSUs. The wisdom to take from that is that it appears as if people have most success using USB-C PD (power delivery) ready stuff and use that to power the keyboard via it's power port. (This appears as having been of help to at least some) While at the same time connecting the keyboard to the computer via the data port and then in all of that use best quality cables (which is rather diffuse and hard to to know/diagnose for user). Having absolutely nothing relating to the problem to test with myself I can only default back to the assumption that, from user report, then the (rather expensive and limited in length) passive Thunderbolt 4 cables appears as the best quality for at least data connection !(?)

The (at least suggested) use of both an USB-C power supply and best cables (and even a self-powered USB-C hub) in case like this of course is to try to eliminate as many fault factors as possible in the a setup to try to either eliminate possible sources to problems or to simplify trouble-shooting. Then one can always go back afterwards and swap parts to try to locate what parts are not working in the setup for what ever reason !

Also it should be understood that while all this 'trouble-shooting' a lot of initial problems with the S - Series MK3 keyboards were diagnosed as mostly relating to driver issues (Matthew_NI, Product Team, 4:58 PM , 2023-11-29) then IMO then that does not exclude that there at least appear as having been other issues related to electronics or cables which all have been completely and utterly blurred (multiple problem sources overlapping) , which in turn complicates things a lot as it either could take a long time to properly pin point other issues due to the blurring which has occurred or at least initially prevent the pinpointing of same issues. Again this is my personal thoughts on the matter and neither do I work here nor do I have a related education/degree to help me or to support my 'speculations' !