Actually, I've managed to solve this using what I suspected was the issue. I've just replaced the model.

1. Created my own model using the uuid trait

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Laravel\Sanctum\PersonalAccessToken as BasePersonalAccessToken;

class PersonalAccessToken extends BasePersonalAccessToken
{
    use HasFactory, HasUuids;
}

2. updated my service provider to use my model

public function boot(): void
    {
        Sanctum::usePersonalAccessTokenModel(PersonalAccessToken::class);
    }

that worked.. is this the best approach?