Welcome to the Community, @vivekcloudcacheconsulting. Thanks for letting us know about this.

Before we can proceed to resolve your concern, did you receive an error message when you tried to integrate QuickBooks Online (QBO) into your Salesforce? Also, I'd like to know which are the SKU doesn't appear. Any additional information would greatly help me provide a suitable resolution to your concern.

Feel free to get back to me by leaving a comment down below. Rest assured, I'll be ready to assist you anytime. Take care and have a good one!