Verify Media URL Error

I’ve migrated an old custom post type podcast to a new podcast channel. But now when I try to add a media url, it doesn’t like the “_” and the “-” characters that I use in URLs. How can I bypass this error without changing all my podcast episode URLs?

Here’s the error in particular after I click verify: “Media URL contains characters that may cause problems for some clients. For maximum compatibility, only use letters, numbers, dash – and underscore _ characters only.”