We have determined that the OTK logout api is not meeting RFC standards. As seen within the OTK documentation we currently require a authorization header and id_token parameters.
Per openid standards the only recommended parameter for the logout api is id_token_hint.
All present OTK releases up to and including 4.5
The OTK logout api is currently not meeting RFC standards.
The OTK development team will be making changes such that the logout api meets RFC standards. These changes are to be included in the OTK 4.6 release.