Crossref warning

OJS Version: OJS

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


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