Maybe if you try to delete (or comment out) the WiFi supplicant file that you uploaded on the umbrelOS it will work?
Try to ssh into umbrel using terminal. If you get in then run a ping and see if you have internet (I use ping 8.8.8.8, which is Google). Also, you can type hostname -I and get the IP address and then go to your router settings and use that info to get the umbrel’s/Raspberry Pi’s MAC address … and then set the IP to a static address, which is explained in this community forum.