First published on MSDN on Jan 03, 2018 I was helping a customer set up hybrid search, when we ran into a frustrating issue. We'd run the hybrid picker, choose hybrid search only, enter the parameters, and say create. The picker would kick off, and then fail quickly, with the message "Parameters too long or contain forbidden character."
2018.01.03 15:15:31.977 *ERROR* [Workflow=Hybrid, Task=HybridSearchConfiguration, Phase=Configure] System.Exception: Parameters too long or contain forbidden character. at Microsoft.Online.CSE.HybridSP.StandardWorkflow.HybridSearchTask.ConfigureHybridSearch() at Microsoft.Online.CSE.HybridSP.StandardWorkflow.HybridSearchTask.Configure()