Why is red badge missing from envelope icon that tells how many texts I've received now missing?

[AC Question]

I get a small envelope icon at top left hand corner of screen but on main envelope icon that usually has a red circular badge with a number on it depending on how many texts I've received but the badge is now no longer showing!

 

[Javier P]

Hi, welcome to the forums! Which phone do you have and what launcher are you using?