Private and paid podcast feeds
Once you have formed the new URL, you can add it to Pocket Casts by pasting it in here: https://pocketcasts.com/submit. Please ensure you un-check the public podcast check box so it can be kept private and never appear in search results and other places. It’s just for you. You can use the short URL you get back to quickly add it to the app.
If this does not work for your feed, contact the podcast author.