We wre trying to implement backchannel logout but unable to get it through.
We are using Itendtity Server 4 on .net core 3.1

Scenario is lets say wordpress site as "Site A", another .net core application as "Site B".
User logs in using "Site B" and Navigate to "Site A", he is already logged in. Working as expected.
User logs in using "Site A" and Navigate to "Site B", he is already logged in. Working as expected.
User logs out from "Site A" and Navigate to "Site B", he is logged out. Working as expected. We implemented back channel logout in .net core application and added "back channel uri "in the open id as per open id standards.
User logs out from "Site B" and Navigate to "Site A", he is still logged in. Not Working as expected. This is due to the reason that i am unable to configure the back channel logout uri for the wordpress.

If anyone has a suggestion for the back channel logout uri, it will be of great help.