OJS Version: OJS 188.8.131.52
When Crossref Plugin scheduledTasks run, DOI are registered but in the log there are a bunch of warning like this:
[Warning] Registration was not successful! The DOI registration server returned an error: 'Unable to add new DOI: Error(400): INVALID ADMIN (403 Forbidden)'.
What should be the reason?
Some dirty records? A wrong configuration?
How can I find more info?
NB: The apache error log doesn’t contain errors about Crossref