I think it's to do with the money laundering laws in that Banks have to keep your ID current. I was sent a similar request a few months ago, same bank different branch. I just took in my passport and they copied it and that was that. Just see the personnel banker in branch they deal with these enqs.  ;)

Carrer Major, 18
43520 Roquetes
Tarragona

Telephone 977 48 42 10

international.customer@lacaixa.es

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