Argo Tunnel error 1033 - 2 sites down!

We have 2 sites that have been down all day. We get the following error when trying to access them by dns hostname:

Error 1033 Ray ID: 5800a61ddeaeed37

Argo Tunnel error

You’ve requested a page on a website that is on the Cloudflare network. The host is configured as an Argo Tunnel, and Cloudflare is currently unable to resolve it.

Anyone have any ideas?

We already double checked DNS and Cloudflare logs and everything is clean. Tunnel is up and running fine but won’t resolve in DNS. I assume this is an Argo tunnel issue at cloudflare internally?

We opened support tickets 3 hours ago but no response from Cloudflare support team.

It seems we may have found the cause - in the cloudflare.yml file - in both of these cases part of hostname is in upper case. for example: hostname: HOST.customer.com

It seems like something changed on the cloudflare side that now makes this case sensitive starting 4/6/2020?

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