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For some customers not all Microsoft cloud IPs for Office 365 are open.Google chrome caused exactly these issues reported, however IE was running fine. One customer hat a damaged browser installation.Strangly audio was working, however not the MIC, after whitelisting the USB device by the local IT in there USB management environment it started to work. Locked down USB ports which do not accept the headset they wish to use.incorrectly configured headset, where the MIC wasn´t allowed to be used as recording device in the system settings.locked down rights on the PC & Internet Explorer which caused that the correct plugins couldn´t run correctly.However we had customers who reported the same, so here is the summary for the issues and solutions we collected so far (as we run a very big environment, there are a lot to share):

But to be on the save side you could run fiddler and check which ports will be used here (including hostnames if you need). I have only seen that the client is using http and https (more infos here).
