What does a 400 error code mean if I'm using the Gmail app on my phone?

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Grade: Education Subject: Support
What does a 400 error code mean if I'm using the Gmail app on my phone?
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If you encounter a 400 error on the Gmail app, it suggests a problem with the app's communication with Google's servers. Force closing and reopening the app, clearing the app's cache and data, or reinstalling the app can often resolve this.