Kbus api module unsupported

I have a 750-8212 with a customer and he is trying to check the kbus api solution, however, it is showing the modules as unsupported.

Modules are
750-400
750-502
750-469


Also the connection with the MQTT broker keeps disconnecting.
Curious if you had seen this in the past.

We had the same problem; check this post:

We went for the MODbus api solution and have things up&running; we use among other modules:
750-492
750-502
750-630
We got thes working over MODbus to MQTT; did not do any benchmark testing/stress testing; still in setup phase.
We had some trouble getting readable values from the -630 SSI module; we can elaborate on that if anyone is interested!