We recommend gently putting the tank on its side on a soft area such as a carpet or grass, etc. and roll it around for a minute or two. Also hold the tank right side up, invert it, right side up, invert it etc. do that a few times a bit vigorously. It is likely that the fill valve floaty on the inside may have gotten locked which can happen in transit or from a fall and this would unlock it and allow for the propane to enter and exit the valve correctly.
In general when filling a tank for the first time, the following procedure should be followed: Pump turned on when the valve is still closed, then open the bleeder screw and slowly open the valve handle. If that doesn't work then you can show this short troubleshoot video to the propane filler.
https://youtu.be/KXZjLaVskPM
Please ensure that the filler tries the part mentioned in the video regarding releasing the pressure from the tank via the screwdriver method at 1:35 in the video. This is a very common issue where a filler may pump the gas in too quickly which would lock the OPD and the screwdriver method will usually unlock that.