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Realtek RTL8188CUS wireless usb stick on Stretch

I'm having lots of problems getting this usb wireless dongle (Edimax) to pick up and connect to a wireless network. I'm not sure if there's a config from an older wireless  getting in the way. The hardware for that isn't installed anymore.

I'm running network manager in KDE

It's detected by lsusb
Bus 002 Device 005: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]

I installed the realtek firmware;
apt-get install firmware-realtek

The drivers seem loaded correctly (from lsmod)
rtl8192cu              69632  0
pcspkr                 16384  0
rtl_usb                20480  1 rtl8192cu
rtl8192c_common        53248  1 rtl8192cu
rtlwifi                77824  3 rtl_usb,rtl8192c_common,rtl8192cu
mac80211              671744  3 rtl_usb,rtlwifi,rtl8192cu
snd_usb_audio         180224  2
snd_usbmidi_lib        28672  1 snd_usb_audio
cfg80211              589824  2 mac80211,rtlwifi

The widget can detect different AP's (I used a test one from my phone to confirm this), I see the one I want to connect to, but when I click on it, it just goes to "configuring interface" and then I get a disconnect notice, "wifi network could not be found". I've turned off the security on my phone ap to test and this made no difference.

Can you point me in the general direction of how to start sorting this out?