Battery Not Charging in MacBook Pro

Run the Apple Diagnostics.

Try unplugging the charger from the electrical outlet for a minute to reset the charger's internal circuitry.

Try using another USB-C port (especially on the other side of the laptop if you have a touchbar model).

Try using another USB-C Charging Cable and power adapter. Not all USB-C cables will charge the laptop.

Here is an Apple article for troubleshooting USB-C charging issues:

https://support.apple.com/en-us/HT204652

If none of this helps then you will need to have Apple examine the laptop.

The only way to know is to try another power adapter and charging cable. You can also try it at another location in case your home electrical system has a problem causing this issue. If you test at another location, then you may still need to perform an SMC the first time you attempt to charge the laptop.

Needing to perform an SMC reset every time indicates that something is causing the Logic Board to have a problem. Whether this is due to a bad Logic Board or a charger/cable/home electrical issue can only be determined by the tests I just mentioned.

If an Apple Store or Apple Authorized Service Provider is open in your area, then have them examine the laptop. Take along your charger and charging cable as well.

I believe I am currently having the same issue with you. Mine is a Macbook pro 13" Touchbar 2017. Have you updated your operating system to Catalina 10.15.4? I believe the problem is caused by the system update as in my case, the issue started to occur after I install the new version of system.