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Microsoft Teams administration error – solved!


Our engineers ran into an issue attempting to update Microsoft Teams through the Admin Center. The engineers opened a ticket with Microsoft Support, and they hadn’t run into this before and thought it was a proxy error. Well, we are working from home and none of us were using any standard proxy. We also weren’t using a VPN and testing with ‘all the standard browsers’ (Firefox, Chrome, Edge, and a few others). No joy.

We *were* able to connect if we used Fiddler. Which is strange because Fiddler is a proxy, right?

Anyhow, we resolved the issue. Super easy. We manually changed our local system DNS to Google DNS ( Can’t really explain that one. I’m using PiHole locally, the other engineer was using Comcast. Both our systems are using commercial network gear with no filtering.

Screen shot and error string below for reference.

Hope this helps someone, because when I searched for the string below (in quotes), I got exactly one unique result that wasn’t very helpful.

Error String:
“We can’t get the effective dial plan so the dial plan can’t be tested.”


Screen Shot:

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