how does customerCode work?

We cannot get customerCode prop to work at all. The video plays without it, which is strange. We are just copying the customer code that is used in the iframe on Cloudflare for the embed, but nothing we do works. The embed itself plays fine, so there is nothing wrong with the customer. Embed shows: customer-{customerCode}.cloudflarestream.com . We tried using customerCode value, but no luck. then we tried customer-customerCode. Still doesn't work. Then we just tried, customer-customerCode.cloudflarestream.com and still nothing. What are you supposed to use for this prop?