Here is my experience:
First, I set the DNS TXT record properly.
Then I triggered the challenge, invoke the /finalize API immediately and got the error response:
{u\'status\': 403, u\'type\': u\'urn:ietf:params:acme:error:orderNotReady\', u\'detail\': u\'Order\\\'s status ("pending") is not acceptable for finalization\'}
So Question is:
How long time does order spent for transforming status pending to ready?
It seem that order status would not change immediately after challenge.
What average time value between pending to ready ?
5 min or more?