Afternoon All,
The issue persists in the current version, though some have noticed it's working. Anyone with a Hotmail/Outlook.com account connected to the new app may have seen it work fine. That's because the links in Hotmail/Outlook.com are rewritten with the Safe Links protection, at least in my case, which led me to the following fix.
Disabled the following setting in your Safe Links policy.
"Do not rewrite URLs, do checks via Safe Links API only."
URL to the safe links policy page.
https://security.microsoft.com/safelinksv2
However, it'll only fix the issue for new emails. Old emails that didn't get their URLs rewritten will still show no URL when you hover over them.