Teams error CAA70007

Hi All,

Just wanted to give my solution.

After taking a look at the advise people posted.

What worked for me is running the application as Windows 8 combability mode.

This is just a work around solution but for now the user is able to use the Teams Desktop app with no issues.

This was for an application in an enterprise environment.

Hey.

I had this issue with my son's teams account at Boroughmuir high school in Edinburgh in Jan 2021.

Very odd.

We have 1x home laptop - W7 - and he could run the Teams Desktop app ok on it.

But on another home laptop on W7 - he couldn't.

On both the web app version works fine, but the desktop app only runs on 1 machine.

It's the same email account being accessed.

The same os on both machines - although they have different versions of W7. 

And different application software installed etc.

I read through *all* of these posts on the issue, and tried all of the likely resolutions, but no joy.

But one of the posts mentioning security caught my eye.

Saying to look in "internet options->Advanced->Security[options]" 

That solution was to avoid checking for invalid certificates etc.. - which I tried also with no joy.

But then I noticed not all of the different (and older) TLS versions were enabled on the problematic laptop.

So since the school is probably using ancient infrastructure, I just enabled all of the older TLS handshake versions and bingo, connection through to the school login page.

That was all it was.

Once I had enabled my side to drop down to as low as TLS 1.2, it worked.

Looking back through the posts, there are obviously multiple reasons for caa70007 - and these have different resolutions.

But most of the credible variations seem to point at an untrusted level of security handshake to the Teams service provider.

So maybe worth a look at your internet security options and see what you can try dialing down as a test.

Hope this helps.

Craig.

While this is not exactly what fixed it for me at least it pointed me at the right direction. Because I have tried everything else - uninstall, clear cache, etc.

What fixed it for me was to 'Restore advanced settings' in Internet Options. Microsoft Store was not working either, before I did that, it just closed on start.

Can someone help? I have the same error code

HELLO 

i have a same problme  error caa70007 for  window 7 , i need to use my team for training online and i cant SOS please