While working on a ticket to test "Add clear-site-data Header on Logout“
, a bug is discovered
https://backstage.forgerock.com/support/issues/OPENAM-21535
So if a customer want to disable the clear-site-data header on logout and uses the AM 's GUI to logout, the clear-site-data will not be removed at the sub-realm because the endpoint is always targeting the root realm
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Hey Sam!
Thanks so much for the heads up and for proactively sharing your solution for the 'Add clear-site-data Header on Logout’ with the community. Your detailed explanation of the issue and the specific endpoint is greatly appreciated! 
While working on a ticket to test "Add clear-site-data Header on Logout “
it only works if you run this endpoint against the “specific” realm
eg
https://[Tenant-FQDN]/am/json/realms/root/realms/[REAM_NAME]/sessions/?_action=logout instead.
If you run against the root realm, eg https://[Tenant-FQDN]/am/json/realms/root/sessions/?_action=logout , the session will be logout but the above header will not be added
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