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Chris Feldhacker IIChris Feldhacker II 

How to pass RelayState to SAML connected service provider?

Per this guide:
https://support.salesforce.com/articleView?id=service_provider_define.htm&type=5
Entity Id
This value comes from the service provider. Each entity ID in an organization must be unique. If you’re accessing multiple apps from your service provider, you only need to define the service provider once, and then use the RelayState parameter to append the URL values to direct the user to the correct app after signing in.

How exactly does one go about passing a RelayState parameter to a Service Provider?  Are there instructions or examples available?  If I just try to append a RelayState parameter to the login URL, then I seem to hit this issue: https://help.salesforce.com/articleView?id=000176508&type=1&language=en_US
...because the URL is not an SFDC Url, rather the Url is an external Url that is valid for the service provider.
Thoughts?