auth.logout() does not send token for proper logout from IDP

[gibsonf1]

The auth.logout() is not sending the token to the Solid server which we need for identifying the user for proper logout.

The code in question is here:

export async function logout(
 storage: AsyncStorage,
 fetch: Function
): Promise<void> {
 const rp = await getStoredRp(storage)
 if (rp) {
 try {
 // First log out from the IDP
 await rp.logout()
 // Then, log out from the RP
 try {
 await fetch('/.well-known/solid/logout', { credentials: 'include' })
 } catch (e) {
 // Ignore errors for when we are not on a Solid pod
 // But tell users it is harmless because they will see the GET failure in the console
 console.info(
 "Couldn't find /.well-known/solid/logout, this is harmless."
 )
 }
 } catch (err) {
 console.warn('Error logging out of the WebID-OIDC session')
 console.error(err)
 }
 }
}

the rp.logout() does hit the IDP correctly, but without credentials, so the next call in this code to then use .well-known/solid/logout is not called as the IDP call returns a 401.

Any idea why rp.logout() is not including credentials?