This workshop was provided within Task 4.3 concerning certification support for digital repositories. Through this certification support workshop, which is the third output in the FAIRsFAIR Certification Support Programme. FAIRsFAIR provides support and capacity building including materials, training and advice for repository managers to improve their knowledge of activities related to the preparations for CoreTrustSeal self-assessments. Participants to this workshop were representatives of the ten repositories that have been selected for the Certification Support initiative, part of FAIRsFAIR Work Package 4 on FAIR Certification. Prior to this workshop, FAIRsFAIR has conducted a survery among the ten repositories. With the survey, we identified common issues that arose during the CoreTrustSeal self-assessment progress. In the presentation, you see the visual ranking of the issues that were most prevalent among repository representatives. During this workshop, we chose to address issues surrounding Long-term Preservation (Requirements 3 & 10), and repository and archiving workflows (R12).