error code 18

Anche io ho lo stesso problema

I tried with the latest ver. of Connect 4.45. and it still doesn't work. I downgraded to Connect ver. 4.29 and its still a no go. When I started LiveTrack with mobile data turned off it started to work. But the moment mobile data were back on LiveTrack stopped. I guess the problem lies within Edge 830 firmware.

GCM ~ System
Build Flavor	vanilla
Build Type	release
Build Ver. Name	4.45
Build Ver. Code	6047
Build Debug	false
Environment	PROD
Auth Lib. Ver.	5.0.1

Android Device ~ General
OS	Android
Ver. Release	8.1.0
Ver. SDK	27
Ver. Codename	REL
Manufacturer	motorola
Brand	motorola
Model	Moto G (5) Plus

I had live-track error 24 for some while. I've found that it was related to my Edge being connected to my indoor bike while standing outside ready for a road ride. So my Edge had GPS, was connected to my road bike and indoor bike, and that crashed the live track. Turning off my indoor bike or move away from the house solved the issue. 

Could be something alike for you? 

I had that one a while back and from memory it was caused by the system thinking there were no contacts to share with . From memory... problem was solved by removing contacts from live track and adding them back . Try that . 

Ho provato ma non funziona,io ho un 1030 e anche un venu sq,non è colpa di connect perché con il venu funziona

Hello, i just got an Edge 830: upgraded to latest firmware 8.20, connected with my iPhone and done all the setup with Garmin Connect app. I have already setted up the emergency contacts for incident alerts and configured Livetrack but Livetrack fails with error code 18 while trying to send a "emergency request" to contacts just says "Impossible to send SMS".

As this is new I can't compare to having previous firmware on it: people with Livetrack error 18 - can you try to send an incident help request sms to see if that is still working for you or both these funcions stopped with this update?

Same problem with my Edge 1030 Plus.  I wish Garmin software was not so buggy.