What does it ask you to calibrate? IMU or compass?
Some
Mavic 2 Pros have a bug that causes it to frequently request compass calibration. I have three
Mavic 2 drones, one of them does that. No fix is available, no firmware updates has corrected it.
To be certain that it is a "false alert" go in the menus in Go4 and find the setting called sensors state. Here you will see if the compass is working OK, with a line going from green, yellow to red. Green is fine.
Another test is that with the drone powered on, placed on the ground, then look at the map and check that the red arrow points in the same direction as the drone. If it does not, your compass is affected.
Be sure that your drone is not close to metal when you turn it on, and remember that concrete most likely has metal rebar underneath.
My drone with this bug flies perfectly fine even if it asks for calibration, but I always check the sensors state just to be sure.
You might have a drone from the batch with this bug.