relationship manager on belongs to many with pivot model throws error

public function Members(): BelongsToMany
    {
        return $this->belongsToMany(Member::class)
            ->withPivot('responsibility_id')
            ->using(ProjectMember::class)
            ->with('pivot.responsibility')
            ->leftJoin('responsibilities', 'project_member.responsibility_id', '=', 'responsibilities.id')
            ->orderByPivot('responsibilities.order')
            ->withTimestamps();
    }

public function Members(): BelongsToMany
    {
        return $this->belongsToMany(Member::class)
            ->withPivot('responsibility_id')
            // ->using(ProjectMember::class)
            // ->with('pivot.responsibility')
            // ->leftJoin('responsibilities', 'project_member.responsibility_id', '=', 'responsibilities.id')
            // ->orderByPivot('responsibilities.order')
            ->withTimestamps();
    }