Opensign admin issue on Synology Content Manager

[tawakung]

Hi, everyone. I am having trouble completing the admin setup after installing OpenSign in Synology Content Manager. I have already installed and successfully navigated to the production URL, but I see a login page instead of the /addadmin page.

I have tried the community solution, such as going to :3001 (and anything else running), but on Synology I did not use Caddy. I tried to download Caddy, but it was not usable. I also tried /addadmin, which said admin already exists. I tried to configure the environment, but nothing works.

I used DSM 7.3, DS920+, and get opensign/opensign, /opensignserver, and mongo 4.4 from the registry. Thank you in advance.