Alguns Recursos Importante para Configurar o Tenant no FilamentPHP V3 / https://codeexperts.com.br

Add tenant id column.txt

$table->foreignId('tenant_id')->nullable()->constrained();

colunas_tenant_table.php

$table->uuid('code');
$table->string('name');
$table->string('slug');

RegisterTenant.php

<?php

namespace App\Filament\Pages\Tenancy;

use App\Models\Tenant;
use Filament\Forms\Components\TextInput;
use Filament\Forms\Form;
use Filament\Pages\Tenancy\RegisterTenant as BaseRegisterTenant;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

class RegisterTenant extends BaseRegisterTenant
{
    public static function getLabel(): string
    {
        return 'Registrar Seu Negócio';
    }

    public function form(Form $form): Form
    {
        return $form
            ->schema([
                TextInput::make('name'),
                // ...
            ]);
    }

    protected function handleRegistration(array $data): Tenant
    {
        $data['code'] = Str::uuid();
        $data['slug'] = Str::slug($data['name']);

        $tenant = Tenant::create($data);

        $tenant->members()->attach(auth()->user());

        return $tenant;
    }
}

tenant_user_table_m_m.php

$table->foreignId('tenant_id')->constrained();
$table->foreignId('user_id')->constrained();