[WITHDRAWN] MyQ LiftMaster/Chamberlain

It’s probably interference causing issues with closing both at the same time. When the opener triggers one of the doors it might be causing interference which prevents the hub from receiving the 2nd command or the interference prevents the hub from reaching the opener with its trigger. A lot of RF signaling happening plus the motor possibly creating some EM.

Where’s your MyQ hub mounted in your garage? If it’s close to your openers, you might try moving it farther away from them.