Test certificate registration does not work at https://acme-staging-v02.api.letsencrypt.org/directory 405 Method not allowed

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Normally that request is a POST. The message indicates a GET was used and received a 405 Method Not Allowed error.

The production system (for now) is more tolerant of these. But, the LE script you use should be updated for current protocol.

See this similar thread. It starts as a DNS issue but also has same GET / POST issue

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