Issue with Token Revocation for Custom Model in Laravel Passport

I've created a portal_users table with its corresponding model PortalUser in Laravel. I’ve added the Authenticatable trait to this model and set up a custom guard and provider as follows:

//guard
'portal' => [
      'driver' => 'passport',
      'provider' => 'portal_users'
]

//provider
'portal_users' => [
      'driver' => 'eloquent',
      'model'  => App\Models\PortalUser::class
],

I can create personal access tokens for PortalUser using Passport, but I’m encountering an issue when revoking these tokens. Specifically, when I attempt to revoke tokens using the PortalUser model, it inadvertently revokes tokens associated with the User model that have the same ID.

Here’s how I’m currently revoking tokens:

$user = PortalUser::find(1);
  foreach($user->tokens as $token){
  $token->revoke();
}

and my tokens are stored in oauth_access_tokens table.

How can I ensure that only tokens for PortalUser are revoked and not tokens associated with other models?