3830417 - Why is my previously registered personal car no longer available on my profile?

I was recently moved to a different Car Configuration by my administrator. When I try to submit a mileage expense, my previously registered personal vehicle(s) no longer appear in the vehicle selection. I am unable to select my car to submit mileage expenses, even though I registered it previously. The car registration has not been deleted, but I cannot see or use it.

Personal Car not visible when adding mileage expense and car registration missing after Car Configuration change. Previously registered vehicle disappeared from the profile post Car Configuration change. , KBA , CON-EXP-ADM-MIL , Mileage Configuration , Problem