A few things to try that might help.
With the key can you unlock the doors.
Can you turn on the radio with key on ignition.
Try swapping the ECU location of each ECU to the other side. Its happened that the slave goes into the master harnus it will give you a safe lock.
I have had this happen in the past and I just left the key in the key on position for about 45 min. But also know that if there isn’t com between the dash the key and the ECU you will get an immob issue. The car starting shows the ecus are working but something isn’t communicating at some point.
The fact you can’t com with the ECU with vag com to me says that’s what you have to really look into.