ST app lost connection with hub and devices

Hi,
Last night my ST App lost connection and I can’t get it to reconnect.
I’m using a Samsung V2 hub, 2 GE z-wave devices, and 2 Wemo devices.
No problems prior to last night.

I recycled the power and network connection on the hub.
Can’t reuse the Welcome Code for the hub.

My wemo devices can still be seen by the wemo app, if that has any bearing on the matter.

What do I try next?

Any assistance would be greatly appreciated.

Have you opened a support ticket with SmartThings?

Yes,
I have been in contact with support via email.
No resolution yet.