Nextcloud.enable-https lets-encrypt fails, 404

I removed the testserver (what I got the thing working on), pointed the a record to the other server, repeated the steps, but no result.
Where should I get the DYNDNS.YOUR.REGISTAR.HERE and <SECRET-TOKEN>?

last time setting dyndns to the domain and secret token from namecheap dns thing
I ran:
curl -s https://raw.githubusercontent.com/ReinerNippes/nextcloud13/master/prepare_system.sh | /bin/bash -

curl -s "https://DYNDNS.YOUR.REGISTRAR.HERE/?fqdn=&lt;YOUR.DOMAIN.HERE&gt;&amp;thisipv4=1&amp;forcehost=1&amp;token=&lt;SECRET-TOKEN&gt;" 

HOME=/root ansible-pull --clean --force -d /root/nextcloud -i 'nextcloud' -U https://github.com/ReinerNippes/nextcloud13.git nextcloud.yml -e "fqdn=YOUR.DOMAIN.HERE" -e "cert_email=YOUR@EMAIL.HERE" -e "ssl_certificate_type='letsencrypt'" -e "nc_db_type='mysql'"

also this is my namecheap’s page:

This article should help you.
https://www.namecheap.com/support/knowledgebase/article.aspx/29/11/how-do-i-use-a-browser-to-dynamically-update-the-hosts-ip

and -e “install_onlyoffice=false” will prevent installation of onlyoffice

and for testing the script you might use -e “cert_stage=’–staging’” as well because letsencrypt limits the amount certificates requests per day.

Thanks for all the welcoming help last year! Now this topic seems really dumb to me.