Can't get TIE fingerprinting appointment

Hi there,

I have been in Barcelona for roughly 40 days now on a student exchange program from the UK. We were told we need to get the TIE appointment within 30 days but I wasnt able to find one in that time. It always just says there's no appointments in any of the Barcelona stations.

I have 2 questions:

1. How bad is it that I've missed the 30 day deadline? What can I do about this?

2. How am I meant to actually find an appointment?

Thanks