Dear Sir or Madam.
We would kindly ask you if you can add our country Slovenia (which is part of the European Union as Austria which is also on the list and it’s right next to the Slovenia). You can see what exactly we mean on this link - https://community.hubspot.com/t5/Sales-Product-Support/Issue-with-adding-a-phone-number-in-HubSpot-CRM-and-the-calling/m-p/593#M213.
Kind regards from Slovenia