I have been trying to book a First or Business Class award ticket for BOS/NYC-ZRH on LX or BOS/NYC-FRA/MUC on LH for May using CO miles. (I have CO Gold status.)

Expertflyer.com shows availability almost daily in May on LX to ZRH in I and O from BOS and JFK.

ANA shows availability in May almost daily in all classes from both cities on LH to FRA/MUC.

Multiple CO representatives today insisted that there are absolutely no seats available for award redemption on either airline in ANY class of service for the entire month of May for any of the above cities.

Either CO is blocking availability or they are completely unfamiliar with Star Alliance booking procedures.

Has anyone else had any similar problems booking Star Alliance award seats on CO?