Unable to recruit Rex as Cheruscii

[milspec]

Playing as Cheruscii in default campaign. Multi-player, allied with 4 other humans players. Can queue the Rex Custodiae unit, and it shows the resources have been deducted. Queue shows "next turn". But then the unit is never built. Tried it 4 times, the same thing happened every time.

Before queuing the unit:



After queuing the unit:



But the unit is never built.

[Stones1985]

If I remember correctly isn't there a limit with these Rex Custodiae (Kings Guard units)?

Do you already have one such unit - if so it may not let you build a second.

[milspec]

Yes, one unit already exists. Thanks! I will check the tooltip and see if this is explained.

[Sarissofoi]

Then why it allow it to be trained?