SSL Certificate Organization (O) and Organizational Unit (OU) need to be updated. We want to change this on my website. My custom O and IU should be updated. This is a issue here i.e GDPR
What steps have you taken to resolve the issue?
I don’t know
Was the site working with SSL prior to adding it to Cloudflare?
Definitely not a claim I’ve ever heard before. The OU name was recently deprecated so you might want to check the source for whoever has made that claim to you.