If you need to transfer the management of a podcast from one Podcast Connect account to another, you will need to follow these steps:
Contact Apple Support here (alternatively you can email PodcastSupport@apple.com)
Apple Podcast Support will then send through a 6 digit code with a message like this: "To transfer management of a podcast in Podcasts Connect, please complete the following step: Insert the six-digit authorization code “123456” in one of your podcast’s tags: <itunes:keywords>, or copyright.
We recommend the copyright tag, which you can access from the Advanced Settings section of your Program Settings.
3. Once you have made and saved the change, let Apple know and they will take care of the rest!