unable to bringup wifi AP "No suitable device found for this connection"

[Patrick Mansfield <patmans yahoo com>]

Hi -

I had my wifi working as an AP at one point, but had to alter things to get my wired
network working (had a bad PCI dual port card and replaced it).

Running up to date Fedora 31, kernel 5.6.19-200.fc31.x86_64.

# nmcli -v
nmcli tool, version 1.20.12-1.fc31

I completely removed and added back the interface using nmcli.

Now when I try to bring it up, I get:

# nmcli con up nm_wifi0
Error: Connection activation failed: No suitable device found for this connection (device lan0 not available 
because profile is not compatible with device (mismatching interface name)).

I don't see how my lan0 is in any way connected to the wifi networking.

I have:

# ifconfig wifi0
wifi0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether d8:3b:bf:5a:16:53  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 104  bytes 17426 (17.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I created it using the following:

nmcli con add type wifi ifname wifi0 con-name nm_wifi0 autoconnect yes ssid alt_umbrella
nmcli con modify nm_wifi0 802-11-wireless.mode ap 802-11-wireless.band bg ipv4.method share d
nmcli con modify nm_wifi0 wifi-sec.key-mgmt wpa-psk
nmcli con modify nm_wifi0 wifi-sec.psk "yeahright"

lan0 is an ethernet connection for my internal lan:

# ifconfig lan0
lan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.1  netmask 255.255.255.0  broadcast 192.168.1.255
        ether 80:61:5f:05:0c:8e  txqueuelen 1000  (Ethernet)
        RX packets 34093347  bytes 48957495346 (45.5 GiB)
        RX errors 2  dropped 0  overruns 0  frame 1
        TX packets 4145306  bytes 3332686109 (3.1 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device memory 0xf6820000-f683ffff

I'm re-naming interfaces using .link files:

# ls /etc/systemd/network/*link
/etc/systemd/network/10-lan0.link  /etc/systemd/network/10-wan0.link
/etc/systemd/network/10-lan1.link  /etc/systemd/network/10-wifi0.link

Any ideas? 

Let me know if you want more details etc.

Thanks :)

-- Patrick