Why won't PayPal let me login?

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I'm trying to connect PayPal to my site. My colleague can login to the platform (not via Shopify), but I cannot (both via Shopify and via PayPal direct). We're using the same login details and password.


It's a .IT (Italy) website. I've tried both PayPal/ IT and PayPal/ UK. Still no luck!


Can anyone thing of some troubleshoot suggestions?