When trying to connect to a network msg says a WPA2 personal is required.

Perhaps this article from Apple may shed some Insights on this issue

link below

If you need help with your Wi‑Fi password - Apple Support

Excerpt from above links and explore in greater detail

Get the Wi-Fi password from another device

Other Apple devices that have joined the Wi-Fi network can share the network password with you. Or you can use them to see or copy the password.

If you are using a wired network connection, you could turn off Wi-Fi. Then when you want to use Wi-Fi again, you can re-enable it and enter the appropriate password. To disable toggle off the wi-fi switch:

I have several Mac devices that automatically connect to my Wi-Fi. Out of nowhere my son’s MacBook Air won’t connect and I get a message that I need a WPA2 password. I don’t know what this is! I keep trying our network pw, which of course doesn’t work.