Unable to connect to Nexcloud page over WAN due to SSL problems

I recently setup a Nextcloud server with NextCloudPi

I’m running
NextCloudPi 1.21.0
Nextcloud 17.0.2.1

Everything is up, ports are open. I’m able to connect locally, despite getting SSL security issues when trying to access the website.

Everything was working great, then within the past few days, I could no longer connect externally and get an SSL error. I am using a LetsEncrypt certificate that is up to date

I had to reinstall my NextcloudPi, after the reinstall SSL did not work. Then I realized to reinstall the windows client and then everything worked again. Maybe this helps.

This is pointing to the certifict not being trusted by any web browsers, Firefox, chrome, bromite, edge, brave all give an error indicating that the site can’t provide a secure connection