• Have you signed the Contributor License Agreement?
• Have you checked that there aren't other open pull requests for the same manifest update/change?
• Have you validated your manifest locally with winget validate --manifest <path>?
• Have you tested your manifest locally with winget install --manifest <path>?
• Does your manifest conform to the 1.0 schema?

Note: <path> is the name of the directory containing the manifest you're submitting.