I cannot connect to any list in sonarr or radarr. i have tried multiple browsers and get the same message: “Unable to connect to import list: HTTP request failed: [412:PreconditionFailed]” Can anyone help me with this please.
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Same issue. When I tap on Authenticate in Radarr, it takes me to trakt, I click the green button and on trakt is says radarr is allowed/connected in my account, but back on radarr it says it isn’t authenticated and throws that error on the test. 
412 might indicate an ad blocker is breaking the Trakt auth. Besides that, I recommend contacting the app developer directly so they can troubleshoot further.