Hi @llcllc21, Sorry for suffering from the bad experience.
Please upload the “Examples > RedBear_Duo > WiFi > ScanNetworks” via Arduino IDE and then check the RSSI strength of each AP. If the RSSI is lower than about -80 dBm even if the Duo is close to the AP, there is something wrong with the antenna. Attaching the result of the scanned AP herein would be good.
Did the problem happen when you were using the chip antenna?