I believe company-org-roam was deprecated at around v1.2.1 in favour of company-capf.
I wrote a quick configuration guide before; it may not be 100% current, but you might be able to take basic ideas away.
Where I am not confident is in the latest version, the support for “fuzzy link” ([[file-name-as-alink]]) may not be present. [[roam:file-name-as-alink]] should work… That is, you might need to type “[[roam:” to get Company to start completing.