MS Whiteboard export to email

A number of Surface Hub 1 devices that we have in use are now unable to export any images created with the Whiteboard app to email.

Either the user sees a message when going through the process of sharing the Whiteboard, export, standard image resolution, email... saying that the device isn't set up for email (dependant on Win10 Teams & Whiteboard versions) or a blue 'email' square popup appears then disappears on screen (if using the latest Whiteboard version).

Our firewall was blocking all Windows Updates traffic to our Surface Hub VLAN whilst we looked into the issue but someone on our Comms team turned off this rule and subsequently a lot of Surface Hub devices downloaded and installed the latest updates and now have this issue.

Current Windows version 

Previous Windows version (where the option to export WAS working)