Could not issue a Let's Encrypt certificate: DNS zone contains an AAAA record, but the domain is not assigned an IPv6 address in Plesk



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    Tino Korth | DrehPunkt GmbH (Edited )

    If you're securing your domains with Cloudflare the problem can also caused by the configuration of SSL at Cloudflare.

    Turn on "Full" unstead "Full (Strict)" mode, secure your domain and re-enable "Full (Strict)" after the issuing worked well.

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