[Is it possible to promote C teams to playable leagues?]

I've managed to promote my affiliate team Xerez to the third tier easily by tinkering with the reputation, but no luck with Sevilla C.

Sevilla Atletico and Sevilla C use the same stadium, so maybe that's the reason why I couldn't promote the latter since it may be hard to schedule matches for second and third tier games.

[Is it possible to promote C teams to playable leagues?]

I'm managing Sevilla and my B team (Sevilla Atletico) has been playing in the second tier for a while. I also have a C team which currently plays in fourth tier and I'd like to promote it to the third tier.

I've already tinkered with team reputation, staff, and players, but I still couldn't manage to get it promoted.

I'm wondering if there is something hardcoded that prevents the C team from to be promoted to the third tier.