Issue with using https within enclosure tags - won't validate the feed

So my company has a few RSS feeds within our Typo3 tt_news site which
when I run through the W3C validation most of them validate, except our
podcast feeds. I get this error:

This feed does not validate.

       line 37, column 3: url must be a full URL:
https://www.digipen.edu/uploads/media/digipen_podclass_issue_33.mp3 (10
occurrences) [help]

        <enclosure
url="https://www.digipen.edu/uploads/media/digipen_podclass_is ...

The weird thing is when I take out the "s" from the links within the
enclosure tags. (So it looks like this:
http://www.digipen.edu/uploads/media/digipen_podclass_issue_33.mp3) It
will validate the feed.

So my question is has anyone had any issue with putting https links
within the enclosure tags and not having it validate with the feed
validator? I am curious as to why it would do this, we believe we can
fix it. We just want to why it could be doing this.

Any help would be great,

Thanks in advance,

Jason


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