Authentication Request goes unanswered with Pixel 5

[caseyonline]

I’m consistently observing a successful Setup three way handshake when connecting my Pixel 5 to my srsran private network. However, the Authentication request (0x52) that follows on the DL to the UE goes unanswered with no indication of why in the logs nor a reject nor failure response (pcap attached)

I’ve confirmed that the IMSI, KI and OPC codes match between the SIM and the user_db.csv file (attached details for both).

I run epc first, then enb (attached logs for both)

Looking at android logs (adb logcat -b radio,events,system,main) doesn’t help me understand this impasse. Are there logs that might provide more detail on the UE side?

I’m using an mcc=001 and a mnc=01. Is that an issue? I’ve also tried mcc=999 with a similar outcome.

Setup
Ettus USRP B205
Pixel 5 (rooted) with Android 14
Ubuntu 22.04 hosting epc and enb services.

user_db.csv
epc.log
enb.conf.txt
rr.conf.txt
user_db.csv.txt
epc.conf.txt
enb.conf.txt
epc.log.txt
enb.trace.txt

[caseyonline]

pcap file between ENB and UE

enb_mac.pcap.txt

[caseyonline]

included the wrong user_db.csv file, this is the correct one
user_db.csv.txt

[caseyonline]

moved to
srsran/srsRAN_4G#1431