We had business users trying to add in their communication sites in the navigation menu (so it shows up in the mega menu) a URL link that is actually a link to an email address. It is the standard mailto:email@example.com link. It looks though this is not a supported format/link type that we can use within the navigation of the communication site. We tried also leveraging the footer as it would be a good place to display the email address of who to reach out/contact with questions but we had the same unsuccessful experience as with the mega menu. Does someone know if this adding a mailto link to the navigation is really unsupported and if so what other options do we have (other than creating a page with a text web part where we can add the mailto link). Thanks!