If you use the emoji 'ID' icon, PUT A SPACE AFTER IT!
My friend was still having a problem with people not being able to add her... until this morning. Another friend revealed the culprit: Android doesn't display emoji, and the lack of a space between that icon and her ID was causing people to leave off the 'J'... because they couldn't see it. It was showing up as a blank square, just like the icon. Makes no sense, but that's what was happening.
REMEMBER THE SPACE!!!
Actually, now that I think about it, I was talking with someone else on Android just the other day about what she could/couldn't see, and any letter immediately following emoji was invisible to her. I just now made that connection, so between ANY emoji and letter, REMEMBER ALL THE SPACES!!! Or you might end up leaving people wondering just what the heck a "ister's ridal hower" is. =P