Hi,

1. Enable "Available in POS" – Go to Sales → Products → Point of Sale tab and check if it's enabled.
2. Check POS Category – Ensure the product is linked to the correct POS category under Point of Sale → Configuration → Product Categories.
3. Restart POS Session – Stop and restart the POS session to reload product data.
4. Unarchive Product – Ensure the product is not archived under Sales → Products.
5. Verify Multi-Company & User Access – If using multi-company, ensure the product belongs to the correct company and user has access.

If the issue persists, try clearing the POS cache (Ctrl + Shift + R) or check the browser console for errors. 

Hope it helps