Hello Steffen,
I update the switch as per compatibility matrix and deauthorize with clean wipe the switch.
I repeated the authorization process again and it is still showing offline as per screen shot.
I refer to the kb article as per your post from the debugging the following error was displayed
daemon: wait for event up to 0s:240000us
361s:891ms:985us flp_event_handler[734]:node: internal1 received event 110 state FL_STATE_READY switchname flags 0x124a
361s:892ms:55us flps_fsm_transition[148]:node: internal1(peer:S524DN5019000072 owner:S524DN5019000072) | state: 2 | event: 110
Unsure what is next step to resolve the offline issue.
Regards