Feed will determine if your feed is valid or has errors, and also include suggestions and/or warnings.
Some warnings can be ignored, depending on what you are trying to accomplish with your podcast.
As a side note, it's also needed to perform Moodle updates.
Validating my feed, it has an enclosure with a URL of https://archive.org/download/Nigel Farage APersonal Message To Northern Ireland Voters./Nigel Farage, a personal message to Northern Ireland voters..mp3 I know it is a bit convoluted...
The Link Checker is part of the W3C's validators and Quality Web tools.
It is not uncommon to encounter problems with your blog or podcast feeds and it is important to know how to resolve these issues.
The best way to diagnose your feed is by using Feed