If you don't get any answer here, you might consider moving this question to the RhoMobile Suite discussion group on this portal: RhoMobile Community
Alternatively, if you get no luck there you could try over at Tau's forum: Home | Tautechnologies
I did take a look at the source code (it is here: rhodes/lib/commonAPI/coreapi/ext/platform/android/src/com/rho/notification at master · rhomobile/rhodes · GitHub ), but I can't see any problems briefly looking at the code (somebody more knowledgeable than me would no doubt have more luck)!
Thank you Darryn,
I moved this thread to RhoMobile Community. Let's hope someone can help me there.
I suspect that this is firmware related problem with Zebra TC75 firmware with regards to this call.
I'll also try to post to Tau's forum.