Hello,
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There are no tools that could help you to submit the package automatically. But the Microsoft Store submission API might help. You could use Microsoft Store submission API to programmatically query and create submissions for apps, add-ons, and package flights for your or your organization's Partner Center account.
Please note it still is recommended to submit your package manually via the Partner Center.
You could check this document for more information: Create and manage submissions.
And you could check the sample code here: C# sample: submissions for apps, add-ons, and flights.
Thank you.
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