Plugin URN OJS 3.3.x x - error on urn designation?

We’d like to add URN to articles in our journal and I am facing a error
On settings, I have defined URN Prefix : urn:cc:4 and use a pattern to URN Suffix : v%vi%ipp%p
Namespace: urn
Resolver URL

I have tested on vol1 and it doesn’t give any error. … and more 3 articles have this urn recorded.

BUT, this link has this error:

# Not Found

The requested URL /urn:cc:4:v1i1pp1-14 was not found on this server.

What I tried to resolve the issue:
I have already tried to include a more complete url, as in homepage =

Application Version - e.g., OJS 3.1.2:
I appreciate any help :slight_smile:
Thank you!