Ignition Issue?

Hello! I need some wizards. So my mk3 was running completely fine until one day I came out of target, opened my car like usual then the alarms started blaring and my car wouldn’t start anymore.

I ended having to jump start the car to make it back home. (Thank god for manuals)Next day I went to a shop because I thought it would have to do with this after market alarm system. But that wasn’t the issue. Remove it and the car still won’t start with the turn of the key.

In the meantime to bypass this I just ran a little bypass switch to the starter and battery and haven’t really looked back since lol. I was wondering if any of you guys know what the issue might be?