Hello @Olof, welcome to the Let's Encrypt community. 
Certbot is no longer supporting Windows, please see:
Also the option
increase the difficulty of debugging I find. That being said Ports 80 & 443 are filtered.
Best Practice - Keep Port 80 Open
$ nmap -Pn -p80,443 swiftle.org
Starting Nmap 7.80 ( https://nmap.org ) at 2024-04-10 23:08 UTC
Nmap scan report for swiftle.org (90.224.206.14)
Host is up.
rDNS record for 90.224.206.14: 90-224-206-14-no2104.tbcn.telia.com
PORT STATE SERVICE
80/tcp filtered http
443/tcp filtered https
Nmap done: 1 IP address (1 host up) scanned in 3.54 seconds
Thus I believe the issue is