LoRaWAN OTAA Failure

I’ve installed LoRaServer and I’ve been able to send data to the concentrator chip IMST IC880A using ABP method for device activation.
But I am yet not available to activate the device using OTAA method.
Currently I’m using AcSiP S76S as a LoRa node and IC880A as LoRa gateway.
Any ideas?

We’re happy to help you, but with this amount of information that is impossible as it could be anything. Please take a look at the logs of each component and search the forum https://forum.loraserver.io/search to see if your specific issue is already covered as there are already multiple topics covering OTAA issues and possible solutions.