Error: Protect call failed for provided string (#1003)

This error message appears when we try to provision new robots. This issue appeared when we upgraded to Orchestrator version 2018.3.3, any ideas?

I had the same error while upgrading it to 2018.4.1. In Web.config file search for “Encryption key”. Update the key from old web.config to the new one web.config file.

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What could cause this in a PaaS environment where there is no app setting for Encruption Key?