When I try to login to fabric in Unity I get this message in console:
[Fabric] An exception has occured; Error writing request: The authentication or decryption has failed.
Target platform is iOS.
Mike from Fabric here. Unfortunately, we made a mistake when we re-issued a certificate for our fabric.io domains on Sept 26 which requires that you re-download and import the Unity plugin into your project. Sorry for this, but once you download version 1.2.8 or higher from https://fabric.io/downloads/unity, you'll be all set.