Just checking - is there anything (like plastic cover tape, etc.) covering the front and rear OA sensor ports? Most new out of the box quads have such protective coverings over the sensors, cameras, lights, etc. on the new hardware, much like a new TV remote control has them on the IR port. If so, remove the tape and try flying again.
Also check your Obstacle avoidance settings in the App: Make sure it is set to avoid vs stop (at least initially).
Lastly - make sure you are in a nice clear area up at least a few feet above the nearest obstacles, and rotate the quad in flight to see if the OA sensor caution bars at top and bottom of your controller screen change or go away, before trying to fly forward and back.
You may have done all the above steps but it never hurts to check: been flying various drones and military UAS birds for years, and I still forget to check the obvious every now and then if in a hurry to get in the air.
Hope this helps!