Problem with Teams meeting Add-Ins in Outlook 2016

[jona_46]

In my organization we have a problem with the complement to generate Microsoft Teams meetings in Outlook. The problem is that when using the plugin to generate a meeting, it displays the following message:

"We couldn´t schedule the meeting. Please try again later".

In my organization we use a proxy server to navigate, I have noticed that if I deactivate the proxy the add-in works correctly.
Anyone had this problem?

[#2]

Hi @jona_46,

did you configure exceptions for your proxy?

Clients need to be able to access some Office 365 URL's and IP address ranges to work properly.

https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges

https://docs.microsoft.com/en-us/office365/enterprise/office-365-ip-web-service

[#3]

We found that the outlook teams addin doesn't support proxy authentication. Also reported here:
https://microsoftteams.uservoice.com/forums/908686-bug-reports/suggestions/41041942-outlook-add-in-d...

The addin would work fine on a machine without a proxy turned on.
We had to set a bypass for:
https://api.scheduler.teams.microsoft.com/
https://mobile.pipe.aria.microsoft.com/

to stop getting http 407's

We had to set a bypass on our proxy for this to work