Those numbers do not make sense. A 1.2 hp 3 phase motor would pull more than 1.8 amps at 208v. I am guessing that this motor is actually less than 1 hp but is advertised as something more, unfortunately that is common.
Motor is probably rated at 1.8A@460V, at 230VAC it would be 4A, and 208 it would be 4.6A. The Teco is rated 4.3A medium duty output. The motor rating are full load ratings. The VFD is protected both for output current and thermally to prevent damage, so the short answer is yes could use it to run the motor, I would run the motor at 220V which will decrease the current, motors are typically fine at a +/-10% line voltage variation. VFD's one always looks at the output current under the desired operating conditions and any deratings applied. This is then compared to the motor FLA. I would suggest you go with the Automation Direct VFD GS21-11P0 which has a rated output current of 4.8A in normal duty (constant torque) mode, it is less expensive and has more features.
It is probably a 1/2Hp motor which would be around 1.8A @ 208V. In either case the VFD would have no problems driving it, you could also check the current either via the VFD or a current clamp. You may also be able to look up the machine specifications if it was OEM to a specific machine.
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