A laptop boots and stops at this message:
Multiple docking stations are not simultaneously supported.
Sometimes two docks are connected. Sometimes there is one visible dock plus a USB-C monitor that also powers the laptop. The warning may even remain after an older dock has been removed.
Replacing cables at random makes this harder. Start by finding the layer that rejected the setup: firmware before the operating system loads, the native display path, or a USB graphics driver such as DisplayLink.
First, record when the failure happens
