Iridium has advised that this issue has now been resolved.
Posted Apr 11, 2018 - 06:50 UTC
Update
We have been advised by Iridium that there is currently an issue affecting the Short Burst Data (SBD) service. Iridium are working to resolve the problem as quickly as possible.
Posted Apr 10, 2018 - 18:15 UTC
In progress
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Posted Apr 10, 2018 - 17:01 UTC
Scheduled
Iridium has notified us that they will be undertaking maintenance during this timeframe. This may result in MO and MT message delivery delays of up to 15 minutes. For further information, please contact your Iridium airtime provider.