This may not have anything to do with the problem, but I'll share.
One time I had terrible moisture problem inside my car (Alfa Romeo), even drops of water on my feet, I looked and looked and just couldn't figure it out. One day this guy at work crawled under the car and found that the rubber drain tube for the air-con evaporator was blocked. A quick snip to clear the blockage allowed the condensation to drain properly, and no more moisture issue inside the car. It was in the tropics and the air-con had to run all the time.
US 2018 Ioniq Plug-In Hybrid Base - Summit Gray