OVH Public Cloud: new Keystone API is my attempt to get @Indigo744 and you working together.
I don’t have OVH and don’t particularly know Keystone. If either of you do, maybe you can consult.
Openstack keystone v3 support #3154 looks like the addition of this, and there are some notes too.
v2.0.3.5-2.0.3.5_canary_2018-04-13
Added KeyStone v3 support to OpenStack backend, thanks @epol
No Keystone v3.x support in OpenStack/Swift configuration #2179
Pull request #3154 partially solves this issue, it supports user/password authentication but not token based authentication.