Related to this question, but in my case I actually am in the situation where all normal seats are occupied.
This is what happens here: the online check-in system is trying to force me to choose extra legroom seats (since only those are available) and pay the additional cost.
It won't let me proceed if I don't do that.
However, this company (Eurowings) does allow checking in in person at the airport at no cost: I am therefore wondering whether to not check in online, go to the ariport check-in gate and ask for the free seats since I think I am entitled to them.
Can I do that, or is the system right? Should I accept to pay the additional cost when all normal seats included in my ticket price are taken?
EDIT Unlike many others, I'm not necessarily inclined to see malice from them here. I have chosen my free seats on their system many times before, always at no cost. This scenario, where all passengers with regular seats have already checked-in online seems quite uncommon and it may very well be that they forgot to implement a solution.