Hi All,
I have an issue with SSL cert where I need your appreciated help to fix it.
I’ve re-installed my HA, set remote access via duckdns using instruction of Effortless encryption with Let’s Encrypt and DuckDNS - Home Assistant (home-assistant.io)
I have the following error when I try to integrate cert_Expiry sensor
Certificate validation error: xxxxxxx.duckdns.org [self signed certificate in certificate chain]
After reading many days and looking for solution I could not fix it. Please Help me! 
in SSH I can get with curl -v command the following:
~ $ curl -v https://xxxxxxxx.duckdns.org
* Trying 84.225.xxx.xxx:443...
* Connected to xxxxxxxx.duckdns.org (84.225.xxx.xxx) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
* CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (OUT), TLS alert, unknown CA (560):
* SSL certificate problem: self signed certificate in certificate chain
* Closing connection 0
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
With SSL checker:
For me everything looks fine. I also read the mentioned web page but no clue how to resolve!
A beer is offered for the solution!!! 
