The key authorization file from the server did not match this challenge

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Your Loopia hosting is intercepting the ACME challenge requests. You'll have to ask them:

$ curl -i 194.9.94.85/.well-known/acme-challenge/look-mum-no-challenge
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 20 Mar 2023 21:36:37 GMT
Content-Type: text/plain
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
X-Loopia-Node: 172.22.234.12

look-mum-no-challenge.-f_daEYxVOFls4aupfol2f4PA8ikqBUw-4tU6dotcK8

You could potentially use the DNS challenge to get your certificate, which will avoid this interception. My certbot-dns-multi plugin supports Loopia with Certbot:

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