2016 Toyota Corolla A/C not working

I just purchased a 2016 Corolla (15000 miles) in Feb 2020. Went to turn on the A/C and hot air comes out. Took it back to the dealer (which was a Nissan dealer) and they did a few tests and recommended I take it to a Toyota dealer. I believe the compressor is working and the freon is charged. Well, this is what the Nissan Service dept told me.

What else can I check out? So mad at myself for not checking the AC when I bought this car. I feel this is why the previous owner dumped the car.