If you use Apple Mail on old Mac computers to access your Gmail account, you may encounter the “Error 400: invalid_request” error message. This error means that your Gmail account is not properly configured to use the OAuth 2.0 authentication protocol, which is required by Google for third-party apps to access your Gmail data. This can prevent you from using a Gmail account. However, there are a few ways you can fix this issue and get access to your Gmail account on Apple Mail, and this guide will help you with it.
To fix the “OAuth 2.0, Error 400” error message on your Mac’s Apple Mail app, you need to give authentication permission to less secure apps on your Gmail account. Also, you might need to generate a unique app password for your Apple Mail app, and here’s how you can do it:
If the above method fails to fix the ‘OAuth 2.0, Error 400’ issue, you can try generating a unique app password for the Apple Mail app using the Google app password feature. This method is effective and a more secure than the previous workaround, and you can do it by following these steps:
That’s everything covered on how to fix the “OAuth 2.0, Error 400” issue on your Mac on Apple Mail. Also, check out our other guides, such as How to fix the Touch ID stopped working after the update on MacBook Pro 2021 or How to fix the “Microsoft error reporting” on Mac.
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