Hey there @Alessandro53,
Welcome to the PayPal Community Forum!
I would ask that you please ensure you do not have any outstanding account limitations. You can view any limitations on your Resolution Center when you select 'Go To Account Limitations'. Any limitations may need to be resolved before you can add a new card.
It is important to ensure this card has your own name registered to it. More information can be found here: I am getting an error when I try to link my credit or debit card. Why?
This could also be a security block. I would suggest waiting for 72 hours before trying to add your card again. After 72 hours, please try and add your card via the PayPal website rather than the app. Please also avoid using any VPNs. I understand you have tried this but please ensure you turn off any VPNs.
If this does not work, I would suggest reaching out to our customer service team directly, again. To contact our Customer Service team, click 'Help' or 'Contact' at the bottom of any PayPal Webpage.
You can also contact us via Facebook PM or Twitter DM's.
For Facebook: https://www.facebook.com/PayPal
For Twitter: @AskPayPal
I hope this helps, have a nice day!
Rebecca
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