Hi @TenacitatemSors,
Sorry to hear that 
Regrettably, there isn’t anything we can do to immediately resolve this, but we’ll reach out to Steam and hopefully have it sorted in the near future.
In the meantime, this issue does appear to be sporadically popping up and resolving itself in most cases, so do keep checking!
Truly sorry for the inconvenience while we get to the bottom of this.