What format should the defaultSelectedUsers be for the pnp PeoplePicker?

[Cardinal_Night]

I'm struggling to populate the people picker here:

   <PeoplePicker
      context={this.props.context}
       personSelectionLimit={3}
       groupName={''} // Leave this blank in case you want to filter from all users
       showtooltip={false}
       isRequired={false}
       disabled={false}
       selectedItems={this._getPanellistsPickerItems}//This is the 'onChange'
       showHiddenInUI={false}
         defaultSelectedUsers={panellists ? panellists : []}
       principalTypes={[PrincipalType.User]}
       resolveDelay={1000}
       ensureUser={true}
      />

I'm trying to populate it with the items retrieved from an SP list. As you can see it is a multi-person PP which accepts 3.

I have a component scope variable that I believe is populated correctly with all users, this logs as:

(3) ["user03@domain.com", "user02@domain.com", "user01@domain.com"]
0: "user02@domain.com"
1: "user01@domain.com"
2: "user02@domain.com"
length: 3
__proto__: Array(0)

But if I add the panellists[] to the defaultSelectedUsers, it doesn't display anything on retrieval. I the formatting wrong?

Regards,

T

[#2]

This seems to have worked, but I need to test it thoroughly, if anyone can see any probs with it please let me know:

public compilePanellists = () => {
    //@ts-ignore
    panellists.flat();
   this.setState({
     Panellists: panellists
   }, () => {
    console.log(this.state.Panellists);
   });
  
  }