Google Workspace sync results in the "Your userbase might be out of date" error
Platform Notice: Cloud Only - This article only applies to Atlassian products on the cloud platform.
Summary
A previously working Google Workspace integration with Atlassian Cloud sync returns the "Your userbase might be out of date" error

Environment
This issue impacts Atlassian Cloud organizations with:
Google Workspace (formerly GSync) integration with an Atlassian Access subscription or
Google Workspace (formerly GSync) integration without Atlassian Access
Diagnosis
The error "Your userbase might be out of date" appears when attempting to sync with Google Workspace under the Identity Providers section, to find this:
Login to https://admin.atlassian.com/
Click on Security
Click on Identity Providers
Click on your Google Workspace IdP
You might also notice a mismatch between the number of verified domains in the following two areas of the Atlassian Cloud UI:
The Identity providers menu will show a lower domain count, because this section is being fetched from the verified domains inside of the Atlassian organization. You can find this section by:
Login to https://admin.atlassian.com/
Click on Security
Click on Identity Providers
But if you click on the Google Workspace Identity Provider settings, the count will be higher. The reason being, this is being fetched from the Google Workspace account directly. You can find this section by:
Login to https://admin.atlassian.com/
Click on Security
Click on Identity Providers
Click on your Google Workspace IdP
To identify the conflicting domain, compare your Google Workspace domains versus your Atlassian Organization verified domains.
To find this you need to:
Login to https://admin.atlassian.com/
Click on Directory
Click on Domains
If your organization is on the new centralized user management UI:
Login to https://admin.atlassian.com/
Click on Settings
Click on Domains
Cause
A domain or domains were unverified from Google Workspace but not removed, causing a sync conflict between Atlassian Cloud and Google
Solution
Delete the conflicting domain from Google Workspace by following the steps in the following Google document:
Re-sync your Google Workspace integration by:
Login to https://admin.atlassian.com/
Click on Security
Click on Identity Providers
Click on Sync now
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