[Bug 1893563] [NEW] netplan: can't login to ap mode with psk

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I've setup my wifi cards as ap over a bridge using netplan.
If I add:

auth:
  key-management: psk
  password: "testinglang"

then my clients are unable to connect.
If I remove those lines above in netplan then the clients are able to connect but without a password.

If I run wpa_cli -i wlp3s0 status, I get:

bssid=4c:1d:96:71:a3:90
freq=2412
ssid=walad2
id=0
mode=AP
pairwise_cipher=CCMP+TKIP
group_cipher=TKIP
key_mgmt=UNKNOWN
wpa_state=COMPLETED
p2p_device_address=4c:1d:96:71:a3:91
address=4c:1d:96:71:a3:90
uuid=85d86b40-7e3d-5fc5-b5fc-aae9af55b29a

I notice that key_mgmt=UNKNOWN. Perhaps that's the problem?

Any pointers on how to debug and fix this?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: netplan.io 0.99-0ubuntu3~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: pass
Date: Sun Aug 30 23:11:48 2020
InstallationDate: Installed on 2020-08-16 (14 days ago)
InstallationMedia: Ubuntu-Server 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: netplan.io
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal patch
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netplan: can't login to ap mode with psk
https://bugs.launchpad.net/bugs/1893563
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