Not able to update toolbarButtons later in conference

My config is like this:

this.options = {
configOverwrite: {
prejoinPageEnabled: false,
userInfo: {

I want to update toolbarButtons later when a user grant mooderator rights to any participant in conference. I am able to use an event to get when a user has been granted the moderator rights. Now i want to add two more buttons in i.e. 1: ‘desktop’, 2: ‘participant-pane’. within the same conference.
I tried with executeCommand (updateConfig, {updatedConfig}) but it says command not supported
tried 1,2 more solutions but no luck yet.

Kindly facilitate , Thanks !!.

It’s overwriteConfig not updateConfig.

Thanks much @shawn