Hey friends, I stumbled across this thread as I am having the same issue too. Im so annoyed. I just got a new ASI Air Plus and I want to use my Sony A7R V with it. They list that they support it in their software update v2.1.2: https://www.yuque.com/zwopkb/asiair/release-log#mf82H but despite this I'm getting the same "exposure failure" error message. Funny enough, I can see everything else about the camera on the ASI Air app, like battery level, ISO setting, etc.. but just cannot take a photo which is ridiculous lol.
I have a ticket open with support as of last week Ive sent them tond of pics and screenshots so ill keep y'all updated if i learn anything new. ive oretty much tried everything suggested above.