What to do when Spain's 'cita previa' website doesn't work

Almost all in-person official processes in Spain require foreigners to book an appointment online first (cita previa), from getting a NIE to a TIE. Here are some possible solutions when the website link doesn't work.

What to do when Spain's 'cita previa' website doesn't work
Almost all in-person official processes in Spain require foreigners to book an appointment online first (cita previa), from getting a NIE to a TIE. Here are some possible solutions when the website link doesn't work.