Email Hyperlinks Underlined in Content Block

Hiya,

Working with a content block (we use them for our footers) and in the content block and email designers the hyperlinks show blue underlines (sometimes purple if the urls have been visited). Even stranger, this blue underline disappears in Outlook Desktop App and Gmail in-browser, but reappears in Apple Mail (also a gmail address).

I've removed underlines within the content block editor. I've tried adjusting the html to text-decoration: none. I've tried removing and re-adding the links.

Most of our mobile audience is on iPhones so ideally want to address this in the Apple Mail app, the design tools aren't as big of a deal.

Strange!
-Ed