Quickset wlan interface bouncing

I was attempting to connect to a Softbank BB Air terminal (Japan) using quick set, but the interface kept bouncing up and down (connected followed quickly by a disconnection/disassociation). The password is correct and there is no filtering on the Softbank terminal side. This behavior was observed across two separate mikrotik (951-h2n and SXT2) platforms after software upgrades and configuration resets. The regulatory domain for each of the Japanese entries was tested as was Bolivia, with the same behavior persisting across router resets after the configuration changes. Correctness of the connection specifics was verified using a Ubiquiti equipment.

Why the f*ck am I having such difficulty connecting?