Apple watch not sending SMS

My apple watch is not sending SMS to android users if iMessage is turned on. I have already unpaired, repaired, received a replacement watch, got a new phone line for the watch from my carrier - Nothing works.

If i toggle off iMessage and toggle it back on, I am able to send SMS but only for a short period before it reverts back to the green bar up top and then returns with a failed message.

Does anyone here have the same problem?