3826361 - Why was my Amtrak reservation auto-cancelled almost immediately after being booked?

User booked an Amtrak reservation that departs within seven days from when it was booked which was auto-cancelled almost immediately.
Why was the reservation cancelled without allowing the approver time to approve?

User booked an Amtrak reservation in Concur departing within seven days, and it required approval. However, the reservation was auto-cancelled almost immediately after being booked. This is because Amtrak requires instant purchase in such scenarios. , KBA , CON-CA-ADM , Administration , CON-SRV-TRV-RAL , Rail , Problem