Very few US banks and financial institutions issue "true" chip-and-pin cards. As I understand it, the major banks (Chase, BofA, etc) and most smaller banks issue chip-and-signature cards to which you can add a PIN. The primary verification method is signature, and a PIN is required for the transaction to go through only if the payment terminal the card is used in demands it. This means that theoretically any US credit card that has a PIN should be useable in any terminal that requires a PIN. Realistically, some automats in Europe require that the credit card chip be programmed so that the primary verification method is PIN, so most US-based credit cards get rejected. This was true as of a few years ago; I haven't travelled to Europe during Covid so I don't know if it remains true. I also don't know whether it is true of unattended gas stations in Iceland.
After some frustrating experiences having to wait in long lines to buy tickets from an agent at train stations in Europe (while Europeans got their tickets in seconds at the automats), a few years ago I decided I wanted a "true" chip-and-pin card that features PIN as the primary verification method. There may be other institutions than FirstTech that issue such cards, but FirstTech doesn't require you to be local and it's easy to apply for a card from them online.
More information can be found in this extremely lengthy discussion - read the Wiki and the last few pages of posts before the thread got closed. https://www.flyertalk.com/forum/credit-card-programs/1815689-usa-emv-cards-availability-q-chip-pin-signature-2017-a.html