I have the same issue. First it doesn't recognize my vehicle in the vehicle drop down in the recipe. Then it stays in "draft" mode (what ever that is) and when I test it, I get the same error as you. If you get a response from TMO can you please post it here?
One of the reasons I signed up for Sync Up was to link it to IFTTT. If it won't play nice I don't see a benefit to it
I called SyncUP support at TMO and I was told that IFTTT and Moj.io are supposed to work together but Moj.io has been having problems. It was first reported in February and was originally supposed to be fixed by the end of February but it wasn't. He had no ETA for resolution and said to monitor "the app" for updates (I assume he really meant monitor the IFTT/Moj.io service). I have been monitoring IFTTT and have seen some Mojio apps disappear from IFTTT.com and then reappear a day or two later so I figure Moj.io is still working on fixing whatever problems exist with the integration.
Wow, I had no clue. It looks like I learned something new today as well. I appreciate you updating the thread after you worked with our Tech Support team. While I'm glad we're already aware of the issue, I wish we had an ETR (estimated time of resolution). Thanks to you, other users will have a better idea of what's going on with IFTTT and Moj.io.