No Enclosure Tags

Dear Podpress support,

I recently sent the e mail listed below to Apple support. They informed me that I had no enclosure tags in my feed. Could you please look at the message below and tell me how to get these tags and proceed?
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Dear Apple Support,

For some reason my latest (fourth) episode is not showing up on my Itunes channel. Thus far, I have had no trouble getting the first three episodes to show. My feed address is https://www.maestromusicians.com/category/feed/podcasts and my Itunes address is https://itunes.apple.com/us/podcast/maestro-musicians-podcasts/id760709932?mt=2
Another problem is that the first three episodes show up without a problem on my iphone Podcast app but don’t show up when I visit the above url on a desktop computer.
Any help would be greatly appreciated.

Thank you,
Daniel Broniatowski

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