Misunderstanding in replies of API

[schoen]

@schoen

If you successfully complete an authorization for a domain with an ACME account, Let's Encrypt caches that authorization as successful for a period of time (I think 7 days) in connection with that account. In all other cases, and whether or not you issue one or more certificates using that authorization, you have to repeat the authorization from the beginning with a new challenge token.

Here is a simpler recent explanation of this issue, and its consequences, in another thread:

Error 403 incorrect txt found

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