Hello @, welcome to the Let's Encrypt community. 
That is very like the case; I observe some Geo Blocking happening.
Here is showing several location around the world getting "Connection timed out"
Permanent link to this check report
Please read these on Geo access for Let's Encrypt needs several diverse locations.
Edit
Also I suggest looking for a different Windows ACME Client
as Certbot Discontinuing Windows Beta Support in 2024