Let's encrypt won't renew a certificate for my Nextcloud AIO

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I’m using the latest version of AIO, I’m a docker n00b and I’m running into a problem with my cert renewal. I have port 80 and 443 fully exposed to the internet. I have run Let’s Encrypt’s tests and they all come back fine for being able to renew my cert but when I look at the logs I see these errors:

2026-03-15T02:27:07.705021269Z {“level”:“error”,“ts”:1773541627.7047014,“logger”:“tls”,“msg”:“job failed”,“error”:“[nc.domain.com] [nc.domain.com] Renew: registering account [mailto:default] with server: attempt 1: https://acme-v02.api.letsencrypt.org/acme/new-acct: HTTP 400 urn:ietf:params:acme:error:invalidContact - Error validating contact(s) :: unable to parse email address”}

How do I update the email address so I can get past this?

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Did you verify your email address is correct (see the very end of the error message)?

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That’s my question. I don’t know how/where to update the email address for renewing the cert. Under my admin account the email address is correct but that doesn’t seem to be the correct place for it.

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maybe this will help… from the LE community forum

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Thanks for the info. How do I run those commands inside the AIO version? Yes, I’m that much of a docker newb. I basically got this up and going enough to have it working since last year.

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So for those who run into the problem in the future I spent a few hours on this and figured it out with the help of Claude.ai since I couldn’t find a good answer in any of my Googling.

During this time the LETSENCRYPT_EMAIL= value was my correct email address.

In the nextcloud-aio-apache container, in /mnt/data/caddy/acme/ I had 2 folders

acme-staging-v02.api.letsencrypt.org-directory
acme-v02.api.letsencrypt.org-directory

Both had configurations for default.json, the staging one had values and the acme-v02 one did not they were just missing.

I deleted both folders and restarted the container. Only acme-v02.api.letsencrypt.org-directory directory got re-downloaded and my certificate was renewed without error.

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@szaimen is this case any interesting for you?

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