FortiClient VPN-only on iPhone failing Phase 1 negotiation

I'm trying to diagnose a FortiClient VPN issue with an IPsec vpn IKE v2. I have the forticlient vpn installed on my iphone 16, my coworker has it installed on his iphone 15, and its installed on a clients iphone 14. My coworker and I have been able to successfully connect to the vpn but the iphone 14 user gets an error -vpn credentials are invalid. I have reentered her username/password multiple times, i've verified the PSK and all other configurations are correct, and have attempted the connection over wifi and cellular on her device. I used the same wifi on my device to successfully connect. I also used her credentials on my device to successfully login. iOS and FortiClient are both up to date. The FortiGate logs reveal that its failing to negotiate phase 1.