Issue with Single Logout

Hello,

I am using ADFS 2.0 rollup 3 as an IdP with Cisco WebEx as the SP.  Thus far sign in, auto account creation and auto account update are all working great.

I am trying to get WebEx single log out working.  Indeed it is working, but there is one feature that does not behave as I expect it to.

I have configured my WebEx site that the single logout URL is:

https://adfs.domain.tld/adfs/ls/?wa=wsignout1.0

I have configured a SAML Logout Endpoint in ADFS in my RP for Cisco WebEx as such:

Type: SAML Logout
Binding: POST
URL: https://adfs.domain.tld/adfs/ls/?wa=wsignout1.0
Response URL: https://site.webex.com/

My RP Identifier is “https://site.webex.com”.

I would expect that after signing me out, I would get redirected back to https://site.webex.com as this is set as the Response URL.  But instead I land on the ADFS logout page and go no further.

What am I missing here?

Thanks!

NPM