Thank you for your question. My name is Steve and I am a fully qualified vehicle technician with over thirty years in the trade, hopefully I can help.
The bulb warning system can be over sensitive and although you have already checked the bulb connections it may be worth just double checking. Also even though the bulbs are working and you have also checked the resistance of the bulbs, the issue may still be with a bulb. You should also check the earth points to ensure that the system has a good earth. As you have a multi-meter this should be easily done to ensure there is no resistance in the loom
I am presuming that the lights and the ignition have been fully turned off, before then turning on again to check the warning message, this would include turning the switch from auto to off (if you have the auto position)
If having covered all these points the warning is still showing then the fault may be in the multi control module.
This is located up under the passenger footwell behind the glovebox and it may be worth ensuring that the connecting plug is good and the connections are clean.
I realise I haven't given you a quick fix but I hope this answers your question, but do please feel free to ask me any further details, if this does answer your question please click accept and rate me, even after you have accepted the answer you can continue to ask further questions using this thread.