Hello,
Welcome to Microsoft Q&A!
Is this allowed under Microsoft's app store rules or will the new app listing get rejected?
If I understand you correctly, you want to keep two versions of your app in the Microsoft Store at the same time, right? Currently, this is not supported for normal apps. You will need to create a new app for ("MyApp 4") and go through the publish process again to publish it.
Thank you.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.