Failed to Connect to Server - Outdated Server - I'm still on (0)

Out of the blue we can no longer connect to the private Tynker Server. We have logged out of both Tynker and Minecraft, deleted and added back the Tynker Server to no avail. Any help/ideas would be much appreciated. Thanks,

Error code we get when trying to connect to Tynker Server

Failed to Connect to Server - Outdated Server - I’m still on (0)

We had some glitches with the latest version upgrade to version 1.16.1. These have been resolved.