Teams login issue and getting error code caa7000

July 15, 2020 | by iaur | posted as App\Client, Teams (formerly S4B)

Scenario

• You are on Windows machine
• Unable to access Teams on the web app
• Getting an error when accessing Teams desktop or web

Microsoft teams won’t allow the user to sign in, getting error code caa70004

With Teams becoming more and more popular so as overlooked basic SaaS configuration. Consequently, Teams login issue and error code caa7000 are becoming more common.

Check your machine’s TLS

1. Open Internet Explorer.
2. Go to the Tools menu.
3. Select Internet Options.
4. Select the Advanced tab. After that, scroll down to the Security section.
5. Check to see if you have TLS 1.1 enabled, TLS 1.2 enabled (checked).  If not, check the box to enable it.
6. Select OK.
7. Close Internet Explorer

Check your custom domain’s DNS status

In this section, perform a look up using the URL below. Moreover, change the last part (YOURDOMAIN.COM) with your custom domain name.

https://webdir.online.lync.com/Autodiscover/AutodiscoverService.svc/root?Domain=YOURDOMAIN.COM

For example, follow this link if you don’t see something like the screenshot below.

Lastly, sign in and run Lync Test Connectivity web tools by MSFT. In addition, add SfBOL’s SRV and CNAME records to your DNS host if you see failures in the results.

After that, wait for propagation then re-run the test after the changes.

Check if Teams apps and sub-services are enabled

Firstly, access the link below with your Global Admin credentials.

https://portal.azure.com/#blade/Microsoft_AAD_IAM/StartboardApplicationsMenuBlade/AllApps/menuId/ (All apps)

After then, find below application from the list and ensure they are enabled.

In conclusion, once everything above is considered in resolving the Teams login issue, check if you can sign-in to Teams web client or desktop client.

Reference

• https://techcommunity.microsoft.com/t5/microsoft-teams/user-can-t-get-teams-to-work-error-message/m-p/775266