Não é possível conectar-se a WiFi com nmcli, embora segredos sejam fornecidos

Question

Estou usando o nmcli no ArchLinux (versão 1.14.5dev + 17 + gba83251bb-1 do repositório oficial de pacotes) para conectar-me ao wifi. Isto funciona perfeitamente para todas as redes sem fios, além desta rede Vodafone EasyBox.

Tentando ativar a conexão com a senha correta, aparece a seguinte mensagem de erro:

Passwords or encryption keys are required to access the wireless network 'EasyBox-123456'.
Warning: password for '802-11-wireless-security.psk' not given in 'passwd-file' and nmcli cannot ask without '--ask' option.
Error: Connection activation failed: Secrets were required, but not provided

No entanto, 802-11-wireless-security.psk é armazenado, como você pode ver aqui:

$ nmcli con show EasyBox-123456
connection.id:                          EasyBox-123456
connection.uuid:                        <hidden>
connection.stable-id:                   --
connection.type:                        802-11-wireless
connection.interface-name:              --
connection.autoconnect:                 yes
connection.autoconnect-priority:        0
connection.autoconnect-retries:         -1 (default)
connection.multi-connect:               0 (default)
connection.auth-retries:                -1
connection.timestamp:                   0
connection.read-only:                   no
connection.permissions:                 --
connection.zone:                        --
connection.master:                      --
connection.slave-type:                  --
connection.autoconnect-slaves:          -1 (default)
connection.secondaries:                 --
connection.gateway-ping-timeout:        0
connection.metered:                     unknown
connection.lldp:                        default
connection.mdns:                        -1 (default)
connection.llmnr:                       -1 (default)
802-11-wireless.ssid:                   EasyBox-123456
802-11-wireless.mode:                   infrastructure
802-11-wireless.band:                   --
802-11-wireless.channel:                0
802-11-wireless.bssid:                  --
802-11-wireless.rate:                   0
802-11-wireless.tx-power:               0
802-11-wireless.mac-address:            <hidden>
802-11-wireless.cloned-mac-address:     --
802-11-wireless.generate-mac-address-mask:--
802-11-wireless.mac-address-blacklist:  --
802-11-wireless.mac-address-randomization:default
802-11-wireless.mtu:                    auto
802-11-wireless.seen-bssids:            --
802-11-wireless.hidden:                 no
802-11-wireless.powersave:              0 (default)
802-11-wireless.wake-on-wlan:           0x1 (default)
802-11-wireless-security.key-mgmt:      wpa-psk
802-11-wireless-security.wep-tx-keyidx: 0
802-11-wireless-security.auth-alg:      open
802-11-wireless-security.proto:         --
802-11-wireless-security.pairwise:      --
802-11-wireless-security.group:         --
802-11-wireless-security.pmf:           1 (disable)
802-11-wireless-security.leap-username: --
802-11-wireless-security.wep-key0:      <hidden>
802-11-wireless-security.wep-key1:      <hidden>
802-11-wireless-security.wep-key2:      <hidden>
802-11-wireless-security.wep-key3:      <hidden>
802-11-wireless-security.wep-key-flags: 0 (none)
802-11-wireless-security.wep-key-type:  unknown
802-11-wireless-security.psk:           <hidden>
802-11-wireless-security.psk-flags:     0 (none)
802-11-wireless-security.leap-password: <hidden>
802-11-wireless-security.leap-password-flags:0 (none)
802-11-wireless-security.wps-method:    0 (default)
802-11-wireless-security.fils:          0 (default)
ipv4.method:                            auto
ipv4.dns:                               --
ipv4.dns-search:                        --
ipv4.dns-options:                       ""
ipv4.dns-priority:                      0
ipv4.addresses:                         --
ipv4.gateway:                           --
ipv4.routes:                            --
ipv4.route-metric:                      -1
ipv4.route-table:                       0 (unspec)
ipv4.ignore-auto-routes:                no
ipv4.ignore-auto-dns:                   no
ipv4.dhcp-client-id:                    --
ipv4.dhcp-timeout:                      0 (default)
ipv4.dhcp-send-hostname:                yes
ipv4.dhcp-hostname:                     --
ipv4.dhcp-fqdn:                         --
ipv4.never-default:                     no
ipv4.may-fail:                          yes
ipv4.dad-timeout:                       -1 (default)
ipv6.method:                            auto
ipv6.dns:                               --
ipv6.dns-search:                        --
ipv6.dns-options:                       ""
ipv6.dns-priority:                      0
ipv6.addresses:                         --
ipv6.gateway:                           --
ipv6.routes:                            --
ipv6.route-metric:                      -1
ipv6.route-table:                       0 (unspec)
ipv6.ignore-auto-routes:                no
ipv6.ignore-auto-dns:                   no
ipv6.never-default:                     no
ipv6.may-fail:                          yes
ipv6.ip6-privacy:                       -1 (unknown)
ipv6.addr-gen-mode:                     stable-privacy
ipv6.dhcp-duid:                         --
ipv6.dhcp-send-hostname:                yes
ipv6.dhcp-hostname:                     --
ipv6.token:                             --
proxy.method:                           none
proxy.browser-only:                     no
proxy.pac-url:                          --
proxy.pac-script:                       --

Eu tentei várias coisas, incluindo reiniciar o NetworkManager / wpa-suplicant, o roteador e desativar o PMF, mas nada funcionou.

Especificar --ask pede uma senha, mas depois a mesma mensagem de erro é exibida. Remover e recriar a conexão usando nm-connection-editor também não funcionou. Funciona sem problemas no meu dispositivo Android.

Como posso me conectar a esta rede?