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If your Warlord is a Tyranid, you can't take an Allied Detachment of Tyranids. The Allied Detachment has this restriction.

You CAN have 2 Combined Arms Detachments, with one having your Warlord though.

You CANNOT have a Combined Arms Detachment of Tyranids with an Allied Detachment of Tyranids in the same army if your Warlord is a Tyranid.

You CAN have a Combined Arms Detachment of Tyranids with an Allied Detachment of Tyranids in the same army if your Warlord is NOT a Tyranid.

Legal
Tyranid CAD - Warlord
Tyranid CAD

Illegal
Tyranid CAD - Warlord
Tyranid AD

Legal
Tyranid CAD
Tyranid AD
Space Marines CAD - Warlord