I'm using the same PayPal.com US-based site since before moving to Spain. And since moving here, I've been able to add my company's Spanish bank account to it - but that was years ago. Maybe they've changed their policy since then(?). Or maybe it depends on your residency. Maybe you have to have residency in Spain in order to use the .COM and add your Spanish bank account. I don't recall, colenot, do you have Spanish residency? If not, that may be the reason for the problem.
I can log-in to the PayPal.es site, but after I do, it immediately forwards me to the PayPal.com site since, I guess, I chose that as my default site.
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