2012 Subaru Outback 6MT Immobilizer?

Just got my car back from the shop. They put in a new clutch on my 2012 Outback 6MT. Before that I put in a new master cylinder. Now I get it back from the shop, got home and the car is doing this: Starts good for about 1second Shuts itself off Security light starts flashing

I have the original key that came with the car and tried my original programmed spares. This car is a traditional key, not a push to start.

Any tips on what I can do to get moving again?

UPDATE\*\* took the car back to the shop and they were able to pinpoint the issue in an hour. A loose transmission ground caused bad CAN messages. Securing the ground fixed the issue