Hi it_shws,

TC20 is compatible with Warehouse Manager App. You'll want to make sure you've correctly set up your mobile scanner device with the app manager. Let me guide you through how to get around this.

To pair your device with QuickBooks company file:

1. In QuickBooks, click Edit and then Preferences.
2. Click Items & Inventory. Then, click the Company Preferences tab.
3. Click Advanced Inventory Settings.
4. On the Site Operations tab, click Add. QuickBooks gives you a passcode.
5. On your mobile device, launch the scanner/app, then enter the passcode.
6. Click Link, then Yes to confirm.
7. A success message appears indicating that the scanner is now linked to your company file.
8. Click Next. Then, continue with setting up a pickers.

For more information about using the Warehouse Manager App, please check this handy article: Set up and use Warehouse Manager App. 

Once done, try using the scanner again.

You can also read about the scanner FAQ's in this article: Troubleshoot Warehouse Manager App for QuickBooks Desktop Enterprise.

You might want to visit our page for future reference: Inventory.

Please don't hesitate to reach out anytime if need help with anything else.