What is the difference between Issuer vs Entity Id.

Entity ID: unique URL that identifies your identity provider as the recipient of SAML requests that Salesforce sends. This entity ID must be the same as the attribute in the SAML assertion. The above definition is quite confusing in the "Salesforce as a Service Provider" scenario and I had tried to make sense out of this sentence many times in the past. IMO, its factually incorrect and Salesforce should either correct it or provide clarification on what they actually mean. In the realm of SSO implementation (outside SF), entity ID & Issuer are sometimes used interchangeably. However, when it comes to SF SSO, in all the implementations I've tried and all the related SF videos that I've seen, the simple definition is as follows: Issuer: Unique URL of Identity Provider Entity ID: Unique URL of the Service Provider

How to Find Entity ID?

In Salesforce, navigate back to Security Controls & Single Sign-On Settings. Locate the configuration you set up previously from the list on the page, then click Edit. From here change the Entity ID field: From: https://saml.salesforce.com.