Custom Code - Arkhip not working

Hi Community, 

Working on adding a custom font to my site - currently not working and looking for ideas to help me. 

Squarespace version 7.0 / Harris template design that I am changing. 

Font Arkhip - otf

Current code that is changing anything on my site:

@font-face {
  font-family: 'Arkhip';
  src:url('https://static1.squarespace.com/static/645eae040417d24d02c493bb/t/647738d0faa0e254c65cfe6e/1685534928515/Arkhip_font.otf');
}

h1 {
font-family: 'Arkhip';
}

Hope you can help - thanks 

The code looks correct. What is site url? We can check problem easier