Trailing Slash Removed from an ID Token’s Issuer URL
Salesforce no longer adds a trailing slash (/) to the issuer URL for
a community that does not have a root path prefix (/) in the ID token. This change conforms to
the OpenID Connect Discovery standard.
Where: This change applies to Lightning communities and Salesforce Tabs + Visualforce communities, accessed through Lightning Experience and Salesforce Classic. Communities are available in Enterprise, Performance, Unlimited, and Developer editions.