CSS hyphen throws error (invalid property value)

To add to their answers to check if you have the right browser at https://caniuse.com/#feat=css-hyphens

You can also check MDN's documentation about it and see how your language dictionary may not be supported yet.

(scroll to the bottom to see Hyphenation dictionary language compatibility) https://developer.mozilla.org/en-US/docs/Web/CSS/hyphens

There is even a footnote that says for Chrome:

No automatic hyphenation, only -webkit-hyphens: none is supported.