The persistent identification of research outputs is part of good research data management practice and is central to the FAIR Principles and the vision of the European Open Science Cloud (EOSC). There are many types of persistent identifiers (PIDs) currently being used to identify data and other kinds of research outputs but also different actors involved in the creation of outputs and the organisations that employ them or fund their work. To foster harmonisation on the use of different persistent identifiers, there is a need to define and implement research data and/or PID policies. FAIR-IMPACT’s Creating EOSC compliant Persistent Identifier (PID) policies support action aimed to help successful applicants to complete self-assessments with regard to their PID policy readiness through the use of FAIRCORE4EOSC's Compliance Assessment Toolkit (CAT) service which strives to encode, record, and query compliance with the EOSC PID policy. The support action did not focus on any specific PID type but rather provided general best practice guidelines on the creation and assessment of PID policies. This FAIR Implementation Story outlines the experience of the EOSC-RAISE project, coordinated by Aristotle University of Thessaloniki in relation to their self-assessment of the application of the RAI ID, a PID for research analysis objects. "We have learned about the challenge of implementing a PID in production. Additionally, we have gained insights into assessing a PID implementation's progress toward fulfilling EOSC policy requirements and periodically evaluating the service's performance to advance the maturity of policy requirements and improve the quality of the service offered." Authors: Evdokimos Konstantinidis, EOSC RAISE Coordinator, Laboratory of Medical Physics and Digital Innovation, School of Medicine, Aristotle University of Thessaloniki Gorka Epelde Unanue, Technical Lead EOSC RAISE, Digital and Biomedical Technologies, Vicomtech Foundation, Basque Research and Technology Alliance (BRTA) Ilektra Makridou, EOSC RAISE Project Manager, Laboratory of Medical Physics and Digital Innovation, School of Medicine, Aristotle University of Thessaloniki Editors: Lassi Lager, CSC and FAIR-IMPACT Rene van Horik, DANS and FAIR-IMPACT