Update from Onmondo -
The signalling and authentication issues have now been resolved. We are fully operational.
We will continue to monitor the situation for any lingering issues. We thank you for your patience.

Update from Onomondo - We have identified the issue and are actively working towards solving it, enabling devices to recover.

We have received an update from Onomondo - "Onomondo experienced issues related to signaling and authentication, which may have affected connectivity. We are investigating and appreciate your patience."