Solution can be found in Post 35
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Channel admin channelgroup has the following powers:
i_channel_modify_power 50 grant 50
i_channel_permission_modify_power 50 grant 50
i_channel_needed_permission_modify_power 50 grant 50
Channel "test" has the follow setup:
i_channel_needed_modify power 50
i_channel_needed_delete power 60
i_channel_needed_permission_modify power 50
But every time a channel admin tries to change the subscribe power, the error "insufficient permission modify power" is given.
Any help or advice would be greatly appreciated. Thanks!