error when trying to request ssl cert using docker,

[samuellhwarren]

Hi guys,
I am new to nginx proxy manager. I have a raspberry pi running the nginx proxy manager container. when I try to access a new ssl cert for my nextcloud instance, I get the following from the logs:

[6/28/2022] [3:37:31 PM] [Nginx ] › ℹ info Reloading Nginx
[6/28/2022] [3:37:36 PM] [SSL ] › ℹ info Requesting Let'sEncrypt certificates for Cert #35: cloud.samuelwarrenconsulting.com
[6/28/2022] [3:37:36 PM] [SSL ] › ℹ info Command: certbot certonly --config "/etc/letsencrypt.ini" --cert-name "npm-35" --agree-tos --authenticator webroot --email "sam@samuelwarrenconsulting.com" --preferred-challenges "dns,http" --domains "cloud.samuelwarrenconsulting.com"
[6/28/2022] [3:37:43 PM] [Nginx ] › ℹ info Reloading Nginx
[6/28/2022] [3:37:43 PM] [Express ] › ⚠ warning Command failed: certbot certonly --config "/etc/letsencrypt.ini" --cert-name "npm-35" --agree-tos --authenticator webroot --email "sam@samuelwarrenconsulting.com" --preferred-challenges "dns,http" --domains "cloud.samuelwarrenconsulting.com"
Saving debug log to /var/log/letsencrypt/letsencrypt.log
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.

Right now, I have the proxy manager pointing to port 80, but my nextcloud app is on port 8181, and I have my router set to portforward 80 to 8181. any ideas or more questions I should answer first?