Hi Ray and Stephen,
Which TFSIe do you have? I have the 2020 55 Competition.
Things i know affect battery. Fully charged, if you put the heating on 21+ degrees, your range is reduced because heating the car uses alot of power, especially with the cold weather around lately. I keep mine about 19C, and that is okay for me. I'm getting about 18 miles on EV on the motorways (70+ mph, where allowed 😉 ). But i get about 22-23 on A roads (55-60mph). I've even had it as high as 25 on A roads in warmer weather doing about 50mph (not my fault for going slow).
I've also read that every time you start the car from 'cold' the battery has to preheat in cold weather. Again, your range will be reduced. So if you do 8 miles to the shops, stop for 1 hour, and 8 miles back home, the battery would have warmed up twice if that makes sense.
I don't think the 2020 Q5's ever did 30 miles on EV. I think maybe the A3 etron can do this as it is a lighter car and no quattro? Dealer definitely lied on this i think. Not sure the 2022 Q5's can achieve this either, but maybe wrong.
I also think your app is out of date? Have you checked the MMI to check the timer is definitely correct? The app and MMI should sync up. When you plug in the type 2, does the scheduled charge button light up, and the main indicator flash green? If so, you should be good to go.
No need to charge to 80% and stop, that is crazy. Like all modern batteries and software, the battery is automatically software limited on the top and bottom end. You'll see in manuals that your battery capacity is around 17KWH, but have you noticed you can only charge up from 0-100% about 12-13KWH? The extra capacity is held at the top and bottom range of the battery so you don't 'kill' the battery. This is the same with mobile phones too.
Hope that helps.