Why didn't you find out in advance or look at compatibility? is there a chance to go to the store and exchange it for the right router? Many stores provide such services. Or a refund. But first, try changing the channel of your router [link|https://192-168-1-1ip.mobi/|https://192-168-1-1ip.mobi/]. Maybe it's just the wrong channel. You are thinking correctly about the password. You can also try changing it. I think there was a crash, and it just doesn't see the new device. I have a similar problem. But I limited myself to changing the channel.