<div dir="ltr">The reason I thought it would support it is because Google has a config requesting <i>Sign-out Page URL. </i><i> </i>I pointed that to our IDP Logout page and it redirects it correctly there. I also found Google has a URL <a href="https://accounts.google.com/Logout">https://accounts.google.com/Logout</a> that will logout all sessions (which we are fine with). I put that in the metadata as:
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures;color:rgb(46,174,187)"><SingleLogoutService </span><span class="gmail-s2" style="font-variant-ligatures:no-common-ligatures;color:rgb(47,180,29)">Binding</span><span class="gmail-s3" style="font-variant-ligatures:no-common-ligatures;color:rgb(0,0,0)">=</span><span class="gmail-s4" style="font-variant-ligatures:no-common-ligatures">"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures;color:rgb(46,174,187)"><span class="gmail-Apple-converted-space"> </span></span><span class="gmail-s2" style="font-variant-ligatures:no-common-ligatures;color:rgb(47,180,29)">Location</span><span class="gmail-s3" style="font-variant-ligatures:no-common-ligatures;color:rgb(0,0,0)">=</span><span class="gmail-s4" style="font-variant-ligatures:no-common-ligatures">"<a href="https://accounts.google.com/Logout">https://accounts.google.com/Logout</a>"</span><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures;color:rgb(46,174,187)"> /></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures;color:rgb(46,174,187)"><br></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal">Now, when I click logout on the Gmail side, I am taken to our IDP logout page that says:</p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><br></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><i><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px">Would you like to attempt to log out of all services accessed during your session? Please select </span><strong style="margin:0px;padding:0px;color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px">Yes</strong><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px"> or </span><strong style="margin:0px;padding:0px;color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px">No</strong><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px"> to ensure the logout operation completes, or wait a few seconds for Yes.</span></i><br></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><i><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px"><br></span></i></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="font-family:Verdana,Geneva,sans-serif;font-size:12px"><font color="#000000">When I click Yes here, the page displays:</font></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="font-family:Verdana,Geneva,sans-serif;font-size:12px"><font color="#000000"><br></font></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="font-family:Verdana,Geneva,sans-serif;font-size:12px"><i style="color:rgb(113,113,113)">Attempting to log out of the following services: </i><font color="#000000">With a Red "X" next to the Entity ID of Google SP. </font></span><span style="font-family:Verdana,Geneva,sans-serif;font-size:12px"><font color="#000000"><br></font></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px"><br></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="font-family:Verdana,Geneva,sans-serif;font-size:12px"><font color="#000000">Maybe this is expected behavior for the IDP properly killing the session and I just did not know what to expect. </font></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><span style="color:rgb(113,113,113);font-family:Verdana,Geneva,sans-serif;font-size:12px"><br></span></p><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><br></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, May 14, 2022 at 2:34 PM Cantor, Scott <<a href="mailto:cantor.2@osu.edu">cantor.2@osu.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Do you have some reason to think they support logout? I wouldn't have any reason for believing that, and certainly not bidirectionally.<br>
<br>
-- Scott<br>
<br>
<br>
</blockquote></div>