ADC87 That's weird, because I connected my Dutch IBAN to my Paypal account like 10 minutes ago without any issues (and my Rabobank IBAN (another Dutch bank) is also connected to Paypal). Maybe if your PayPal account is set up in France, for example, you can only connect French IBANs? I live in the Netherlands, so both my Paypal account and my IBANs are Dutch. No idea if PayPal checks that
I've never ran into issues of my Dutch IBAN not being accepted, but I'm also not working/living outside the Netherlands (and when I'm abroad I use my Mastercard, not my IBAN)