Certbot unauthorized and connection errors - spring-boot

Question

I have a spring boot application on Google Cloud, CentOS 7. I wish to install SSL certificate via Let's Encrypt and Certbot. When I use certbot --apache -d mydomain.zone command I receive an error:
My domain is registered on Namecheap. My A records on Google Cloud:
Also I provided google cloud nameservers in Namecheap like in this tutorial: https://www.wpmentor.com/setup-domain-google-cloud-platform/
Can you tell me where the issue is? I also wonder is there an issue with my java code in app. For example sometimes while accessing index page, error_page is called. When I have a method in my controller:
#RequestMapping(value = "/error_page", method = RequestMethod.GET)
public String homeError(Model model)
{
return "/error_page";
}
I have a different certvbot error:
but when I comment/erase my controller method for error page I receive this error:
Can it be it's an application bug? Or issue with apache?
EDIT:
I tried to turn off Tomcat. Now I receive this error:
note: My Apache forwards to 8080, I don't know will it make any issue?
iptables -A PREROUTING -t nat -p tcp --dport 80 -j REDIRECT --to-port 8080
After curl -I -L http://mydomain/.well-known/acme-challenge/zySNHSFB-qL95Ubx4jcIvuHPiiNbwkphE55kFuqP8jM:
HTTP/1.1 302
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Location: /error_page
Content-Language: en-US
Content-Length: 0
Date: Tue, 15 Feb 2022 20:01:50 GMT
HTTP/1.1 302
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Location: /error_page
Content-Language: en-US
Content-Length: 0
Date: Tue, 15 Feb 2022 20:01:50 GMT
curl: (47) Maximum (50) redirects followed

Answer 1

I needed to turn off the Apache web server to free my port 80. Also, I deleted iptables rule that forwards traffic from port 80 to port 8080. Now Certbot works