If you are transferring ownership/management of a podcast, Apple might need you to verify this with a six-digit authorization code provided by Apple Podcasts. 

To insert the six-digit authorization code in the <itunes:keywords> or <copyright> tag in your RSS feed, you'll need go to your latest uploaded track and click the edit button under the waveform. Then add the six-digit security code in the description box and save the changes. Finally, get in touch with Apple again so they can proceed.  

Learn more on how to submit your RSS feed below: