Test Office Add-ins

I have developed an Office add-in for Excel and would now like to test it under production conditions before it is deployed and published in AppSource. Is there any way to test the add-in under production conditions? The only thing I have found so far is the ability to do this via sideloading (https://learn.microsoft.com/de-de/office/dev/add-ins/testing/test-debug-office-add-ins#sideload-an-office-add-in-for-testing). But that is not a real test environment for me. Are there any other possibilities?

Sideload is our recommendation to test your add-in before you do public publish.

If you plan to publish your add-in to AppSource and make it available within the Office experience, make sure that you conform to the Commercial marketplace certification policies. https://learn.microsoft.com/en-us/legal/marketplace/certification-policies

After you submit, A validation test will be conducted. please pay attention to following areas:

• Add-ins must follow design guidelines without impeding the customer experience within the host application.
• Add-ins must be compatible with all versions of Internet Explorer 11 and later, and the latest versions of Microsoft Edge, Google Chrome, Mozilla Firefox, and Apple Safari (macOS).
• Add-ins must work in all Office applications specified in the Hosts element in the add-in manifest.
• Add-ins must work across all platforms that support methods defined in the Requirements element in the add-in manifest,

For more information about the validation policies, please refers to https://learn.microsoft.com/en-us/legal/marketplace/certification-policies#1120-office-add-ins