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The second-level domain wildcard is the same as the name of the top-level domain certificate dns txt. Value is different - Help - Let's Encrypt Community Support
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Incorrect TXT record "v=spf1 -all" found at _acme-challenge.serv.org.com - Help - Let's Encrypt Community Support
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Tutorial: Using Let's Encrypt SSL certificates with your LAMP instance in Amazon Lightsail | Lightsail Documentation
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