Service Immobilizer?

I would try your spare key to see if that works if not you can try a hard reboot which is done by removing the negative side of the battery, with the cable loose from the negative side of the battery, hold it to the positive terminal for 1 minute this will discharge the memory capacitors in the BCM and PCM allowing the system to reboot. If that does work, we need to do a CAN scan to see what codes come up.

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Disarming (Active and Passive)
Active disarming occurs when the RKE transmitter is used to unlock the vehicle doors. This disarming will also halt the alarm once it has been activated. Passive disarming occurs upon normal vehicle entry (unlocking driver door with the key) or turning the ignition switch on with a valid skim key. This disarming will also halt the alarm once it has been activated.

Tamper Alert
The VTSS tamper alert will sound the horn three times upon disarming after an initial alarming has occurred to indicate a tamper condition has occurred.

Manual Override
The system will not arm if an occupant uses the manual lock control to lock the doors or actuates the locks after closing the doors.

Please let us know what happens.