@Charles Chiko . From the error message, it seems the package name is already used. In fact, the app's package name must be globally unique in Google Play (not just unique within your enterprise or Google Play Developer account). You need to contact your app developer to change to a unique name.
https://learn.microsoft.com/en-us/mem/intune/apps/apps-add-android-for-work#managed-google-play-private-lob-app-publishing-directly-in-the-intune-console
Hope it can help.
If the answer is helpful, 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.