Hi Natalia,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
When the power supply is connected to your Surface and plugged into a power source, the LED indicator on the tip of the charging connector will be lit when your Surface is getting power. If the LED indicator isn’t lit, you may have a problem with your power supply.
Check that the Smart Charging feature and Battery Limit Mode on your Surface are turned on.
Smart charging on Surface - Microsoft Support
Surface Battery Limit setting - Surface | Microsoft Learn
Manually update Surface drivers and firmware: Download drivers and firmware for Surface - Microsoft Support
Run the Surface Diagnostic Toolkit: Fix common Surface problems using the Surface app and Surface Diagnostic Toolkit - Microsoft Support
Since only a handful of devices are affected, you might consider reimaging or performing a factory reset on one device to see if it resolves the issue. However, make sure to back up any important data first. Restore or reset Surface for Windows - Microsoft Support
If you have another Surface power supply available, try using that to charge your Surface. If your Surface has a USB-C port, try using a USB-C PD charger instead. If those work or if you don't have another Surface power supply or USB-C PD charger, start a service order for your power supply. Otherwise, start a service order for your Surface. How to get service or repair for Surface - Microsoft Support
I hope this helps. If there is anything not clear, please do not hesitate to let me know.
Your Sincerely
Hahn. W - MSFT | Microsoft Community Support Specialist