4. Verify the user availability setup

Next, verify that you set up user availability correctly.

You're on step 4 of 5

Verify your availability setup

1. Sign in to a Google Workspace account, create a Google Calendar event, and enter the email address of a Microsoft Exchange user to invite them. For details, go to Invite people to your Calendar event.

   The Exchange user's availability status should be visible.

2. If you can't view their availability status, check the activity and status of your users in the Calendar audit log. For details, go to Check the Calendar log events (below).
3. If there are no errors in your Calendar audit log, sign in to a user Exchange account, create a calendar event, and enter the email address of a Google Calendar user to invite them.
4. If you can't view the Calendar user's availability, try the Calendar Interop Tools to resolve any issues.

Use the log & tools

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Check the Calendar log events

Once your users start using Calendar Interop, you can check their activity and status in the Calendar log events of the audit and investigation page. For details, go to Calendar log events.

If you encounter errors in the Calendar log events, go to Calendar Interop error messages & codes for troubleshooting information.

Use the Calendar Interop tools

1. Open Calendar Interop Tools.
2. In the User availability lookup tester section, enter the email address of a user in your organization, using one of the following options:
   • To verify whether an Exchange user can query the availability status of a Google Calendar user, enter the email address of a Google Workspace user.
   • To verify whether a Google Calendar user can query the availability status of an Exchange user, enter the email address of an Exchange user.
3. Click Perform test.

The tool issues an availability query for the user and includes a request and response. If the request was unsuccessful, you’ll get an error summary.

Troubleshooting

Autodiscover endpoint couldn't be discovered

If you receive an "Autodiscover endpoint couldn't be discovered" error, you need to check the Exchange-initiated connection to the autodiscover endpoint. One possible issue is Exchange only allows connections in TLS 1.0 while Google Calendar requires TLS 1.2.

To resolve this error, we suggest updating Exchange to the latest service pack and cumulative update. Then turn on TLS 1.2 through the Microsoft Windows registry. A system restart might be needed afterwards. For more information on TLS registry settings, consult this Microsoft article.

If this doesn't resolve the issue, follow these general troubleshooting steps to investigate further:

1. Install a packet capture tool (for example, Wireshark) on the Exchange server.
2. Start a packet capture on the machine.
3. Open a command prompt (CMD) window.
4. Enter the ipconfig /flushdns command to empty the DNS cache.
5. Reproduce the issue by trying to retrieve Google Workspace user availability from Exchange in the troubleshooting tool. Make sure you receive the same "Autodiscover endpoint couldn't be discovered" error.
6. Stop the packet captures.

Analyze the packet capture results to find packets containing the name of your autodiscover endpoint (for example, autodiscover.googleworkspace.altostrat.com), or the IP address of your web server. It will detail how Exchange is attempting to connect to the web server, and should reveal where it's unsuccessful.

_{Google, Google Workspace, and related marks and logos are trademarks of Google LLC. All other company and product names are trademarks of the companies with which they are associated.}