Find my iPhone/ Mac all devices offline
Note: Apple required me to select a device so I have just selected one at random but the problem is affecting ALL devices.
I recently got a new iPhone.
It appears on Find My iPhone. However, my iMac, my 2x MacBook Pro and my iPad now show as offline.
When I log into Find my Mac via iCloud using my iMac the devices are still offline, including even the Mac I'm logged in from. This seems extremely strange.
Any ideas what's going on here??
MacBook Pro 15″, macOS 10.14