Please share which barcode scanners models you are using.
On Loyverse website are posted the some models of barcode scanners for Andoid and iOS devices. However there are general requirements for barcode scanners to function with Loyverse POS.
Android devices works with scanners supporting HID protocol. You can use scanners with Bluetooth interface or USB scanners via a USB OTG adapter/cable.
IOS devices supports only Socket Mobile 7Ci and Socket Mobile 7Qi scanner models.
The built-in rear camera of iOS Mobile Device can be used to scan item barcodes during sale or adding new items to the list.