Ios App Configuration crashes-Not able to connect to a network

As I already mentioned in this post you cannot configure beacon via mobile phone, because LTE beacons does not have configuration, but microApps which you can upload only using WebIDE (video).
You also cannot select carrier because it is chosen automatically (based on availability and signal strength). If it does not connect to the Cloud it might be lack of LTE Cat-M1 in the area. Please check this post how to enable GSM fallback.
If you are not able to connect to the beacon via WebIDE please elaborate more on what is happening.