Microsoft Teams not connecting “We couldn’t connect to the internet”: env_check_error

the error no longer occurs since the MS teams application was updated (can not remember but it should be one of the last versions of 1.2 or one of the first versions of 1.3).

Here are the steps for the workaround again:

• Sign out and close any instances of Microsoft Teams running.
• Navigate to the following path: %userprofile%\appdata\Roaming\Microsoft\Teams
• Create a json file called hooks.json
• Use your favourite notepad editor, add the following line to the newly created file: {"enableProcessIntegrityLevel": false}
• Save and close the file.
• Now, re-open Microsoft Teams and sign in.

In the current MS Teams version (1.3.00.30866 x86), the settings.json file contains the "enableProcessIntegrityLevel" value several times, sometimes it is "true" and sometimes "false". This led to a malfunction (webcams and microphones were sometimes no longer recognized), so that we had to delete the hooks.json files from the user profiles.

Until then, the solution with the hooks.json file had worked well. The solution can also be used for other purposes to define settings for the MS Teams application.

Sorry, I was not aware that questions that do not contain an answer are still considered unsolved.

I've recently had a ticket open with Microsoft for this exact issue and we came across a fix. It seems like the issue is to do with the mail attribute not being filled for users, this happens if you do not have an Exchange license assigned.

We're still using an on-prem mail solution, so we aren't using O365 for Exchange. However, assigning a O365 E3/E5 trial license to the user (which should include an Exchange license) fills in the mail attribute for the user. You can use the graph explorer to query a user's attributes:

https://developer.microsoft.com/en-us/graph/graph-explorer

Use a GET request, beta, and query the user with the following: https://graph.microsoft.com/beta/users/emailaddresshere

We've also found that removing the trial license after a few hours keeps the mail attribute filled, which in turn should resolve this.