It is not compulsory to complete the Microsoft 365 App Certification for your application to be published on the Teams Marketplace, but it is recommended. Completing the certification process can help ensure that your app meets the standards for quality, security, and compliance that Microsoft requires for apps to be listed on the Marketplace.
If you do not complete the certification process, your app will not be removed from the Teams Marketplace, but it may not be discoverable by users who are searching for apps that meet the certification requirements. Additionally, Microsoft may periodically review apps on the Marketplace to ensure that they continue to meet the certification requirements, and if your app does not meet these requirements, it may be subject to removal from the Marketplace.
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