Nextcloud version (eg, 20.0.5): Nextcloud Hub 6 (27.1.0)
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04 LTS
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.18.0
PHP version (eg, 7.4): not sure! running NC from a Docker container & not sure how to check.
The issue you are facing:
Hey there 
I’m trying to keep my installation up to date via the AIO interface; previously, I could do this via the Admin → Overview tab, and clicking the “Open Nextcloud AIO Interface” button.
I’ve since done some work on my server, configuring nginx (non-containerised) to redirect a new subdomain to my NC process. Now, when I click the “Open Nextcloud AIO Interface” button, the browser opens a new tab (still displaying my chosen NC theme) reading:
Page not found
The page could not be found on the server or you may not be allowed to view it.
I’d had to manually change my NC’s configuration.json file to use my new subdomain; I’m wondering if maybe I should have also updated my AIO_TOKEN value on that page, and then this is causing the error.