New contacts provision their pre-keys on the UUID path (`/v2/keys/UUID`), instead of on E164-basis (`/v2/keys/+32...`). This makes WF unable to send messages to devices registered with an official client after about Februari 2021. ## Resolution We resolve this in two steps. 1. After #80, the other Signal user will be able to initiate the session. After this, we have a **workaround**. 2. We need Signal profiles (#192), at least partially, to fully resolve this issue, because those resolve the UUID for a given E164.