My organization has deployed over a dozen of these Dell P2425HE monitors, and users sometimes see the following prompt from them when they are powered on:

The current input timing is not supported by the monitor display.Please change your input timing to 1920x1080, 60hz, or any othermonitor listed timing as per the monitor specifications.

No matter what resolution or refresh rate is chosen, the monitor prompt will continue to appear. A current workaround for this issue is to unplug the monitors and plug them back in. These monitors are connected to Dell Latitude laptops via the monitor's provided USB-C cable. There is no firmware update on Dell's support page for these monitors.

I've created this discussion in case others are experiencing the same issues with these monitors and are wondering if other people are also noticing the problem.