You will only be able to see podcast series that you follow on Spotify. To follow podcasts in Spotify -
1. Go to the Spotify app 2. Go to the Podcasts section 3. Select the podcast series that you want to follow and tap the "Follow" button 4. Go back to the Mighty app 5. Go to the Browse screen and pull down on the screen to refresh your library. The podcasts will now appear in the "Podcasts" section.