Intermediate or root certificate signed by lets's encrypt

Is it possible to have an intermediate or root certificate signed by lets's encrypt for internal environments (test environments, for example)?
if possible, how to apply ?

thank you very much in advance

No, that's not possible.

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Even if they did (which no, they won't), in order to be publicly trusted it would need to follow the same standards as their main service, of validating that you control the name.

Your best bet is using a DNS-01 challenge, if you have a publicly-visible domain name. As long as you can make the TXT record for your names, the names themselves don't need to resolve on the public internet.

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