I am trying to set up SSO with Splunk and AzureAD. I have used these guides: https://docs.splunk.com/Documentation/Splunk/7.1.3/Security/ConfigureSSOAzureADandADFS (Splunk) and https://docs.microsoft.com/en-us/azure/active-directory/saas-apps/splunkenterpriseandsplunkcloud-tut... (AzureAD).
When trying to access Splunk and logging in via AzureAD, I get the following message from AzureAD: "... The reply url specified in the request does not match the reply urls configured for the application: ...". The reply url configured in AzureAD is "https://[mySplunkServer]/saml/acs".
What would be the next step to debug this? Is there a way to verify that the reply URL in Splunk is actually "https://[mySplunkServer]/saml/acs"?
My issue was that I used the wrong name for my splunk server in the Reply URL configured in Azure AD. I found out by looking at the SAML requests/responses between Splunk and Azure AD which are logged by Splunk if DEBUG logging is activated for certain loggers.
Where did you get to see this information? I'm having the same problem as you in an integration I'm doing.