I have this problem. I really like Teamviewer and have been using it to support my daughter and parents as well as maintaining a couple of computers around my house - very useful as I broke my leg recently! I have previously reccomended TV to my employers. I shan't be doing that again. It appears to me that TV have been making a vast number of wrong calls in automatically and incorrectly detecting 'commercial' use on non-commercial accounts. So with that it mind I can no longer suggest that this is a reliable solution in a commercial context. This problem has affected me and my family but it would be worse if something similar affected a business. Just in case it helps, as I have seen little in this thread about what may trigger this issue, in my case this is what occurred immediately before the ban hammer came down: I used a hotspot on my mobile phone to connect through my usual Surface to my home media server. I forgot to close the hotspot on my phone and simply shut up the Surface. When I returned home a couple of hours later I noticed that my hotspot was still active, my Surface was still connected to it and TV was still open. I closed it all down and switched to my laptop to connect again to the media server in my property. I got the notice that commercial use was detected. Since then, despite being promised 5 minutes of connection time, I get about 1 minute before it closes and then I'm unable to connect for 10-15 minutes. This makes all but tiny tasks impossible and I have been unable to assist my daughter with her homework (she often needs help with Photoshop and Office). My guess it was the length of the connection, left idle through my hotspot that was flagged. I've submitted logs, twice. The form submission has been acknowledged on both occasions and I've twice explained the situation at length. I'm now waiting on whatever happens next - although I'm deeply concerned I'm falling into the black hole so many others have descibed. I'm not really seeing anyone say "hey, I filled in the appeal form and everything got fixed". As things stand, I've got to consider alternatives. There's pain in switching and I really don't want to. But as the window for a possible and uncertain resolution to this issue is so incredibly long I may well have to eat it up and somehow have my relatives install a different solution (I certainly couldn't do it for them inside the 60 second window I'm allowed and that's probably intentional). Should that happen, TV have lost a fan and a potential customer and turn them from an ambassador to a vocal critic.
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