The Eth-Trunk is Down because the lower threshold for the number of active interfaces is incorrect.
Run the display eth-trunk trunk-id command to check whether the lower threshold for the number of active interfaces of an Eth-Trunk is set.
If the number of Eth-Trunk member interfaces in Up state is lower than the lower threshold, the Eth-Trunk becomes Down.
Run the least active-linknumber link-number command to configure the lower threshold for the number of active interfaces of an Eth-Trunk to be smaller than the number of Eth-Trunk member interfaces in Up state.
The local and remote devices can be configured with different lower thresholds for the number of active interfaces. If the lower thresholds are different, a larger value becomes effective.