Joining crew battle problem (slot availability)

[DoctorВo]

Dear Support,

could you please help me to join my crew battle as unfortunately the system says "You can't join the recruitment because your manager slot is taken." Though I have a free slot (third one). I tried it on PC, iPad and mobile OSM client (Android platform) with the same result. Relogged as well.
Please see attached screenshots for details.

Thank you in advance.
DoctorBo.

[DoctorВo]

@DoctorВo UPDATED: CASE IS CLOSED
Clue: I've never used this slot for any game yet
First simulation I had made it accessible

[DE XRIST]

@DoctorВo
Good to know that ... good games mate....