Last tested: Oct 2020
This error comes up for SSO embed URLs. Basically, there are two main reasons:
The link needs to be hit within 5 minutes of it being generated. Try generating the link again.
The time on the server generating the URL is actually 5 minutes off of the time on the Looker server. Check what the servers think the current time is with the
datecommand line call.
This portion is mentioned in our docs right here: https://docs.looker.com/reference/embedding/security#sso_embed_parameters
"The signed part of the URL contains a timestamp. Once the URL is used to sign on, that time must be +/- 5 minutes from the current time."