Kindly follow these steps shown in the below source to set up properly your wireless adapter on Tails:
Enable a wireless device
You can also refer to the following once for more info:
Connecting to a network
If you still have issues with the wireless connection, then plug the adapter it into a different USB port on your PC, and try again to connect to the captive portal through the unsafe browser as shown in the lecture. Or use the Ethernet cable to connect Tails directly to the network.
Kindly note that USB devices can only be connected to only one machine at a time, so make sure that the wireless adapter isn’t attached to Windows first before you try to connect it to Tails.