Cannot connect to WiFi with nmcli, although secrets are provided

I am using nmcli on ArchLinux (version 1.14.5dev+17+gba83251bb-1 from the official package repository) to connect to wifi. This works perfectly for all wireless networks apart from this one Vodafone EasyBox network. Trying to activate the connection with the correct password gives me the following error message: 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 However, 802-11-wireless-security.psk is stored, as you can see here: $ nmcli con show EasyBox-123456 connection.id: EasyBox-123456 connection.uuid: 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: 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: 802-11-wireless-security.wep-key1: 802-11-wireless-security.wep-key2: 802-11-wireless-security.wep-key3: 802-11-wireless-security.wep-key-flags: 0 (none) 802-11-wireless-security.wep-key-type: unknown 802-11-wireless-security.psk: 802-11-wireless-security.psk-flags: 0 (none) 802-11-wireless-security.leap-password: 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: -- I tried several things, including restart NetworkManager/wpa-supplicant, the router, and disabling PMF, but nothing worked. Specifying --ask asks me for a password, but gives me the same error message afterwards. Removing and recreating the connection using nm-connection-editor didn't work either. It works without any problems on my Android device. **How can I connect to this Network?**