Filament: Get default tenant when using Jetstream https://silvanhagen.com/writing/filament-get-default-tenant-for-user/

User.php

<?php

class User extends Authenticatable implements HasDefaultTenant // and more stuff like FilamentUser, HasTenants, ...
{
    public function getDefaultTenant(Panel $panel): ?Model
    {
        return $this->currentTeam ?? $this->allTeams()->first();
    }
}