Hello 
I have a problem with DOI registration in one of the journals. DOI numbers from 1 to 5 can be registered, but it is impossible with further numbers . I get the information that “The given DOI suffix is already in use for another published item. Please enter a unique DOI suffix for each item.” The DOIs haven’t been registered - I confirmed it with CrossRef. I have no idea what the problem may be.
Please help:))
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