Cant save configuration for Sonoff USB Dongle Plus V2 (ZB-Dongle E)

Hi,
I am trying to configure the Sonoff USP Dongle Plus V2 with Silabs Multiprotocol Addon for zigbee2mqtt.
According to the documentation I found I specified serial as

port: tcp://core-silabs-multiprotocol:9999
adapter: ezsp

However trying to save the configuration fails with the error message:

Failed to save add-on configuration, does not match regular expression ^zstack|deconz|zigate$. Got {'data_path': '/config/zigbee2mqtt', 'external_converters': [], 'devices': 'devices.yaml', 'groups': 'groups.yaml', 'homeassistant': True, 'permit_join': False, 'mqtt': {'base_topic': 'zigbee2mqtt'}, 'serial': {'port': 'tcp://core-silabs-multiprotocol:9999', 'adapter': 'ezsp'}, 'advanced': {'log_level': 'warn', 'pan_id': 6754, 'channel': 11, 'network_key': [1, 3, 5, 7, 9, 11, 13, 15, 0, 2, 4, 6, 8, 10, 12, 13], 'availability_blocklist': [], 'availability_passlist': []}, 'device_options': {}, ...

According to the error message, only zstack, deconz or zigate is allowed as adapter.
The problem occurs for me with the Zigbee2MQTT add-on 1.18.1-1 as well as with the latest Zigbee2MQTT edge add-on.

Any advise how to get the configuration proper?

A very old version, and the last version posted to the old, now defunct repo.

My guess you are still using the old repo. If you are, even that repo’s edge version is probably over two years old.

The new official repo is GitHub - zigbee2mqtt/hassio-zigbee2mqtt: Official Zigbee2MQTT Home Assistant add-on.

Current version is 1.35.1.