[keycloak-user] keycloak does not send backchannel logout requests to Admin URL

I created a client in Keycloak and set up a test admin URL https://webhook.site/12c50381-0814-441a-82bb-1a68c8366a60 (this is a webhook testing site). After that, I performed an OpenID login via this client, and then sent a logout request to Keycloak. I did this a couple of times, and tried two ways of logging a user out: - redirecting to http://.../auth/realms/myrealm/protocol/openid-connect/logout <http://127.0.0.1:8080/auth/realms/myrealm/protocol/openid-connect/logout> - force logging out of the user via Keycloak admin interface: http://prntscr.com/pv1v76 The user indeed gets logged out. However, in both of these cases I don't see any requests coming out from Keycloak. The testing website shows zero registered requests. How do I make this work? -- Mikhail Novikov