I've had similar issues. I could not connect to my work's WiFi, but everything started working once I activated my VPN. I was then able to input my username and password, connect to PCs, and use the app properly. I'm using a WiFi-only Samsung Tab S3 on Android Oreo with Private Internet Access as my VPN. Not sure if these are related, but my work's network does not allow most VPN connections. The VPN connection is only allowed if I use remote port 53. PIA will auto cycle through ports to see if one works - maybe Teamviewer needs a similar feature?
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