To use the scan option in the Audiopoint app you have to generate a QR code first.
Use any tool on the internet, for example,

The link in the QR code must be : audiopoint://<Device-IP>:<Subscription-Port>/<Channel Name>

For Example: audiopoint://

Now scan this QR code with "Scan Code" option from the Audiopoint app and the app will add this channel to the channel list and play it.

Using DNS names instead of IP-Addresses do not work with the QR Scanner!