Error 1016 - Origin DNS error - Load Balancer

I am getting the following error message when I enable load balancing:

Error 1016 Ray ID: 590f7803982e6b59 • 2020-05-10 00:15:58 UTC

Origin DNS error

My load balancer includes one pool with two origins in it:

The load balancer’s address is (same as the first origin).

I start getting the above error within a few seconds of enabling the load balancer. When the load balancer is disabled, both origins are perfectly reachable and work as expected.

I have tried setting the proxying status to “DNS only” for both origins as suggested in one of the threads here. Nothing changes.

The “Community Tip” doesn’t help as my origins resolve and work perfectly in the absence of the load balancer.

How do I get them to work behind the load balancer?

Using Cloudflare DNS servers by the way.

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