Have you set user/password to vodafone/vodafone? VF has a very detailed instruction at
You could also give office.vodafone.com a try (found that APN on numerous websites, but cannot try myself since I live in Germany). If that does not work, I would contact their support. Maybe a SIM swap can help.
Otherwise, /e/ might also be the culprit here. It is still beta software officially (see their FAQ, q “Is /e/ stable?”).