Learn how to troubleshoot and resolve the "Error 400: invalid_request" issue when using G Suite Marketplace add-ons due to account restrictions. Understand the common causes and effective solutions to regain access. --- Disclaimer/Disclosure: Some of the content was synthetically produced using various Generative AI (artificial intelligence) tools; so, there may be inaccuracies or misleading information present in the video. Please consider this before relying on the content to make any decisions or take any actions etc. If you still have any concerns, please feel free to write them in a comment. Thank you. --- G Suite Marketplace Add-on OAuth: Error 400 - Invalid Request and Account Restriction When using G Suite Marketplace add-ons, encountering an "Error 400: invalid_request" can be frustrating, especially when it's tied to an account restriction. This error typically occurs during the OAuth authentication process, preventing users from successfully authorizing the add-on. In this post, we'll explore the causes of this issue and provide steps to resolve it. Understanding the Error The "Error 400: invalid_request" message is a generic OAuth error indicating that the request sent to the server is invalid. When this error is accompanied by a message stating "Account restricted," it suggests that the issue is related to the user's account settings or permissions. Common Causes Insufficient Permissions: The account used to authorize the add-on may lack the necessary permissions required for the OAuth process. Domain Policies: G Suite administrators can enforce policies that restrict access to certain third-party applications and add-ons. Account Suspension: If the account has been suspended or restricted due to policy violations or security concerns, OAuth requests will fail. Invalid OAuth Request: The request itself might be malformed or missing required parameters, leading to an invalid request error. Troubleshooting Steps To resolve the "Error 400: invalid_request" with an account restriction, follow these steps: Check Account Permissions Ensure that the account you're using has the necessary permissions to access the G Suite Marketplace and authorize add-ons. This may involve checking with your G Suite administrator to confirm that the required permissions are in place. Review Domain Policies If you're part of a G Suite domain, your administrator may have set policies that restrict the use of certain add-ons. Contact your administrator to review these policies and request the necessary changes to allow access to the add-on. Verify Account Status Check the status of your account to ensure it hasn't been suspended or restricted. If you suspect your account has been compromised or restricted, reach out to Google Support for assistance in resolving the issue. Validate the OAuth Request Ensure that the OAuth request being sent is correctly formatted and includes all necessary parameters. Developers should refer to the OAuth documentation provided by Google to verify the request details. Re-authenticate Sometimes, simply re-authenticating can resolve the issue. Log out of your G Suite account, clear your browser cache, and then attempt to authorize the add-on again. Conclusion Encountering an "Error 400: invalid_request" with an account restriction when using G Suite Marketplace add-ons can disrupt your workflow, but it is often resolvable by addressing account permissions, domain policies, and the OAuth request itself. By following the troubleshooting steps outlined above, you can identify and fix the root cause, restoring access to the add-on and continuing your work seamlessly. If you continue to experience issues, don't hesitate to contact Google Support for further assistance.