Hello @Novotnyjachym,
Thanks for reaching out and welcome to the PayPal Community! I can see how receiving those kind of errors can be a bit confusing. Normally that error means the IBAN number you're entering doesn't correspond with a bank that either we work with or recognize. I would recommend reaching out to your bank one more time to double check that you have the correct IBAN and Account number.
Good luck!
- Jon K
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