Digitalocean Ubuntu22.04 Installing Cerbot (Let’s Encrypt) Fail

Hi,

I followed the digitalstartup tutorial, and the digitalocean tutorial. And google for answers. After 24 hours, I still can’t install Let’s Encrypt. I use Ubuntu 22.04 and Apache/2.4.52

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator apache, Installer apache

Which names would you like to activate HTTPS for?
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1: 123456.com
2: www.123456.com
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel): 1
Requesting a certificate for 123456.com
Performing the following challenges:
http-01 challenge for 123456.com
Waiting for verification...
Challenge failed for domain 123456.com
http-01 challenge for 123456.com

Certbot failed to authenticate some domains (authenticator: apache). The Certificate Authority reported these problems:
  Domain: 123456.com
  Type:   unauthorized
  Detail: 143.198.52.216: Invalid response from http://123456.com/.well-known/acme-challenge/tbVmsPzznx_-ZAkS_ST1tJCLZrAQN3FpezKg9n5QfPs: 503

Hint: The Certificate Authority failed to verify the temporary Apache configuration changes made by Certbot. Ensure that the listed domains point to this Apache server and that it is accessible from the internet.

Cleaning up challenges
Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.