Additional information about your network (Hardware you are trying to connect to, hardware you are trying to connect from, router, access point, used operating systems, ...)
Ender 3 PRO
This is the first time I'm connecting it, I'm on the same network, the Pi is a bit further from the router but I doubt this would be the problem.
2020-09-03 21:18:31,811 - octoprint.plugins.pi_support - WARNING - This Raspberry Pi is reporting problems that might lead to bad performance or errors caused by overheating or insufficient power.
!!! UNDERVOLTAGE REPORTED !!! Make sure that the power supply and power cable are capable of supplying enough voltage and current to your Pi.
You also might have a flash icon at the navbar:
Restart the Pi without the printer connected. If that icon does not appear try this:
If it still appears, you should look for a better power supply (not charger)