The DOIs for all of our articles in the latest volume of our journal, published mid-December seem to be broken. They redirect to an Error: DOI Not Found webpage.
Having just published the December issue, we are receiving inquiries from our contributors regarding citations for their articles and the bad DOI links.
We looked at all the DOIs and do not find any typos in them or anything - unusual characters, for example - that we do not normally include in our DOIs.
We initially thought the problem might be a lag in the activation of the DOI links; however, the problem has not resolved over 2 weeks later.
We are using the latest OJS version, 3.3.0-8.
What is the problem and how can we resolve it?