Single Sign-on Error /_nc_external/identity/saml/SamlError

[bgarner]

https://adminconsole.canvaslms.com/_nc_external/identity/saml/SamlError

Salesforce message, single sign-on error:  We can't log you in because of an issue with single sign-on. Contact your Salesforce admin for help.

Any ideas, thoughts, suggestions for a fix. Have opened a ticket already, but have not heard back. I found a few help articles outside of the community, but have yet to resolve. Thanks in advance for your feedback.