Recently the ICCID unlock method gives Activation Errors. As we know this happens everywhere except the USA where AIO-SIM are used successfully. We are working on a solution to this issue and we will update the available AIO-SIM firmware once we have it.
The error is due to changes in the activation process and is still possible it will start working once more as this is not a SIM invalid error but really an activation error. Normally if the sim is not supported the user should see SIM Invalid. Also is possible that this will be solved once the new 12.3.2 is released for other models except iPhone 8. In any case we already started working to find alternative solutions.