Hello,

There is no support of identity OS-EP-Filter/endpoint service.
https://docs.openstack.org/api-ref/identity/v3-ext/?expanded=list-associations-by-project-detail#list-associations-by-project
https://github.com/openstack/keystone/blob/ba2e4b83e88d5c1576e9d2cd6a760367deef3a62/keystone/api/os_ep_filter.py#L145-L154

I'm working on it.