If you're importing a podcast from Anchor.fm, you'll need to contact their customer support to set up a feed redirect. Per their support site:
If you're looking to change your podcast host from Anchor to another host, you can also utilize the 'Contact us' button at the top of the help center to let us know. Our support team can help you with that switch.
You'll want to have handy:
- Your new Pinecast RSS feed URL (you can find this on your podcast dashboard)
- The name of your podcast
- Your Anchor.fm email address