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 ws3.morpher.ru (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” https://community.cloudflare.com/t//44264 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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