I have installed zotero on my debian-13 system through the following means as described on the github repo:

wget -qO- https://raw.githubusercontent.com/retorquere/zotero-pkg/master/install.sh | sudo bash
sudo apt update
sudo apt install zotero

Steps to reproduce the issue:

Open the fresh install of zotero, and click on the sync button. Then click the login button, and a page gets opened on firefox. Log in and get a "Your Zotero application has been logged in to your account." succesful message. Returning to the desktop app however, leads to a "Waiting for login..." message that loops indefinitely.

For the zotero connector side of things, my debug ID is: D2009883005
For the application side the debug ID is: D884966257

I'm seeing the issue might be the "API key not set" message in the error report, but how do I set it?

Attempted solutions:
# installed gnome-keyring, because I did not have it previously
# created a new API key and added a user.js file to my profile with the following:
user_pref("extensions.zotero.sync.storage.backend", "file");
user_pref("extensions.zotero.sync.apiKey", "my_key");
# checked that zotero was listening on the correct port

For the record, I have not been able to login at any point before either.