Hello. My garmin instict solar have not working barometr. Error 83886. Can someone have known Solutions for This? Regards

Have a look at the following post and see whether it helps. If not, then I am afraid the only remaining option is contacting the Support:

Altimeter/barometer/thermometer/PulseOX --> Sensor Hub Rollback - Instinct Solar - Wearables - Garmin Forums