ORCID has several controls in place to discourage more than one ORCID iD for a researcher. When you register, they check for duplicates based on name and only one ORCID iD per email address is allowed.
However, it is possible you have more than one ORCID iD. Use the step-by-step guide in the EUR ORCID LibGuide for removing your duplicate ORCID iD.
