Not too familiar with the Foxwell, but did you copy information under "display battery information" about the new battery? It should tell you amp hours, manufacturer, serial number etc.
Thanks! Was it an H5 or an H6? If it was an H6, did you have any issues with the battery not wanting to sit flat in the battery tray? It looked flat when I installed it, but the car was parked at the curb on quite a slant from the crown in the road. After she moved the car, it was obviously tilted. (At least an AGM battery isn't going to leak electrolyte if it isn't flat.) I thought I counted 10 digits but I may have been off when I was trying it--I was rushing because I was trying to squeeze in this favor between two other events.I put in an AGM battery in my Mk7 Golf R last fall. I have a VAGCOM and battery type was one of my choices for my adaptation and I changed it to fleece. The car will adapt to the new battery without the adaptation. One difference would be the AGM can be charged to a slightly higher voltage which I assume the car does when you change the battery type to fleece. I think you got rejected because the serial number was too short. Ross-Tech says serial number is 10 digits. Battery Replacement - Ross-Tech Wiki