NAS Authentication Error (ngKSI already in use) & (Synch Failure)

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Hello @tim1207,

we tried with two different UEs - ASUS Zenfone 8 & Robustel R5020. Could you please indicate where UE settings could possibly be incorrect? Since both of these end devices worked fine with other core networks. Could it be possibily an issue with the integrity or ciphering algo? or something else. Your support would be highly appreciated.

I am also attaching the pcap file for Zenfone testing here.
free5GcoreZenfone 1.pcap (50.1 KB)

Thanks in advance!