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I have seen the same problem with the Fedora 29 KDE Spin. I agree that integration with KDEWallet is probably involved. As a short term fix I have successfully used two solutions:

• The other solution I have tried was to use nmcli command line tool to bring up the link: sudo nmcli -a connection up <name of network>. Note that the -a will cause nmcli to ask for the password for the network, which is really the reason this probably helps. Also note that I did this after using the Plasma NetworkManager applet to select the network and enter a password, so NetworkManager was aware of the network I was trying to bring up. I suspect you need to try to configure a WiFi network connection with NetworkManager first before using the nmcli connection up command to bring the network up. Creating a new network connection can be done with nmcli, but it is probably easier to use the graphical NetworkManager applet provided for Plasma. I needed to run the nmcli command at least once per boot, maybe once per login.