Moved from F5 on prem LB to Cloudflare now getting a 520 error

Last night we attempted to migrate from our on-prem F5 to cloudflare. Once we got everything setup and attempted to reach the site we kept getting a 520 error. We could not figure out what was causing this. We then decided to roll back and everything is back to normal. The certs are the same since we imported them from the F5 to cloudflare. We even tried creating a cert on cloudflare with no luck. Any ideas on what could be causing this?

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