docs.geotools.org SSL certificate renewal failed (letsencrypt)

[strk]

Something wrong was reported upon letsencrypt cert renewal for docs.geotools.org (still needed?):

Processing /etc/letsencrypt/renewal/docs.geotools.org.conf
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Cert is due for renewal, auto-renewing...
Non-interactive renewal: random delay of 158 seconds
Plugins selected: Authenticator apache, Installer apache
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for docs.geotools.org
Waiting for verification...
Cleaning up challenges
Attempting to renew cert (docs.geotools.org) from /etc/letsencrypt/renewal/docs.geotools.org.conf produced an unexpected error: Failed
authorization procedure. docs.geotools.org (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient
authorization :: 140.211.15.6: Invalid response from
https://docs.geotools.org/.well-known/acme-challenge/Xeu03iLu0Mv7QrxIV4lhGrfd0OzfJokvUepDF3CjmUk: 404. Skipping.