Multiple email addresses in FIR app

What is the correct separator to use to add multiple email addresses to the "Optional Notifications Email(s)" section of the app?

I have been unable to add multiple email addresses to the mobile app when submitting an issue.

Thanks, Rich Phillips

The FIR apps (iOS and Android) are basically shell apps that display the FIR web site in a frame – so it would be the same there (if that helps at all – I don't know beyond that).