I'll help you secure your validation code for QuickBooks Desktop, andrew104.

To get your code, you can check your Customer Account Management Portal. Here's how:

1. Log in to CAMPs using the credentials connected to your product.
2. Select QuickBooks version 2013 under Products & Services.
3. Choose Details and complete the steps in getting a validation code.

Regarding the customer number, are you referring to the license number? 

After opening your CAMPs and you still can't get a validation code, I suggest contacting our QuickBooks Desktop (QBDT) Support Team. Here's how:

1. Open QuickBooks and go to Help.
2. Select QuickBooks Desktop Help and click Contact Us.
3. Enter a brief description of your concern, then select Continue.
4. Sign in to your Intuit account, click Continue, and then Continue with my account.
5. You'll receive a single-use code. Enter it and hit Continue.
6. Click to Chat with us or Have us call you.
    

Furthermore, I'll add this link for frequently asked questions about migrating from QBDT to QB Online: Prepare your QuickBooks Desktop file for migration to QuickBooks Online.

Comment below if you have additional questions about securing your validation code. I'm here to help. Take care!