Handoff / Continuity Problem

[aussie_geek]

Hey all,

Having an issue on the Apple Watch series 4 handoff feature.

Its to do with Mail - I have 3 accounts - Gmail, iCloud and Outlook.

Gmail and iCloud inboxes /. mails Handoff perfectly to the Mac.

However, when I try to use continuity on the Mac to view an active message on my outlook account, a loading window comes up in Mail an the message does not load.

Anyone else have an issue like this and if so is there a fix?

Watch OS 5.0.1

MacOS 10.14 Mojave.

Thanks.