Same happened with me, EU citizen and resident, they rejected my application, after a few months later I tried it again with a different email and phone number, same outcome.
I found that funny because I was never rejected from any EMI before, so it︀ is a new experience.
I am also a shareholder of Nebeus on Seedrs, and honestly︁ I don't like how they ignore the questions there, and their ownership structure looks strange,︂ seems like Russian owned and the Spain location probably just a front.
Now I'm happy︃ they didn't open my account, I don't like Nexo either because they are doing shady︄ things but I would much rather trust Nexo than Nebeus.