You can use the corporate approach and tell them that you are recording the conversation and show them that pressed record on your device. Let them choose if they want to continue the conversation without verbally expressing that option to them. If they make it a point to ask you to stop the recording, you can choose to stop and simply take notes.
First. Breathe. Do some mindful meditation if you’d like.
Second. Do NOT quit!
Third. Know that you can call in sick on Monday if you need to.
Fourth. Find a lawyer that specializes in employment law and Americans with Disabilities Act (ADA) issues. You can do this by contacting a lawyer that is busy and specializes in something else (like real estate, or whatever) and asking if they know someone that can help. Most lawyers won’t charge for an initial consultation, so use that first call/meeting to it’s fullest.
Fifth. Go into the office and find out what their response to the email(s) is. There’s no point in guessing and avoiding finding out. Record conversations (find out about consent for recording in your state). Write notes.
They are generally counting installations of the app. So it does take conscious effort to be one of the counted. But it’s certainly less friction than most new services.