DNS Challenge is "pending" 2 days

That's not enough. You have to send a command to the challenge url,

https://acme-v02.api.letsencrypt.org/acme/chall-v3/1221077576/ICKcCg

then Letsencrypt starts the validation.

So Letsencrypt waits that you send that command -> pending, pending, oh, again pending.

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