Upload update of transferred App

I was able have an app transferred from another AppleID to my personal AppleID. The transfer seemed to go OK (https://help.apple.com/app-store-connect/#/deved688524f) however there seems to be a problem now when I try to update the app. I've changed 'ownership' where I can see but when I uploaded the new version, the old bundleID no longer matches my new AppleID format. Do I keep the old bundleID? I'd prefer not delete and recreate the app. That was why I chose the transfer method. Any suggestions, thanks,. David