Only conscripts would believe armed forces would be welcomed. Professional soldiers cannot for a single minute have believed this, nor paramilitary police, nor high command.

What they didn't expect is resistance. To date, externally leveraged coup have generally won. They didn't expect popular support for opposition in place.

You're right to air domination. They obviously expected to fly in to the civil airports and waltz in. Telling the conscripts women would shower them with flowers and kisses was just to pacify the innocents. Once the doors open, things changed.