Hi
@Infinitysl,
I must mention that normally for a device to work it should have:
- Android 8 and above,
- Come with Google Services preinstalled by the vendor
That said, these criteria apply for mobile phones and only major/ well known brands have been tested so we can't really guarantee normal functionality on a device that does not fall under this category such as a PDA.
Something to try: Send a Welcome Email instead of using the QR code, open the email on the pda device and try to configure the 3CX App by opening up the attachment (config file).
If other devices can scan the QR then we know it's a device specific issue and I'd say your best bet is to speak with the manufacturer regarding why this does not work.