Update: it was an issue with API keys due to a previous install.

Update 2: new problem, qBittorrent has an I/O issue, probably involving the final destination for the media: my Synology NAS. Any advice here is appreciated.

Update 3: I was having issues with mapping my Synology NAS as the root folders, so I restarted the *arrs and now they are unreachable. The solution was to reinstall them without uninstalling them because my computer is weird.

Once a year I try setting up Prowlarr, Sonarr, and Radarr and I felt confident so I reinstalled them. The *arrs are connected to qBittorrent (all tests succeeded) and Prowlarr (again, tests succeeded) and vice versa. I added every indexer that I could successfully connect to (which was most of them) and currently have all of the web UIs open : which work as expected. Everything seems to be communicating and functioning as intended so I tested Radarr. I found a popular movie and started monitoring it, this was about 30 minutes ago. It hasn't shown up in qBittorrent and I'm not sure what I'm missing; can someone help me troubleshoot? In other words, how do I know definitively that this movie I have selected will download and when will it download?