Missing liquid Damage Indicator
I have the iPhone 11 Pro Max, I went in to upgrade it at TMobile/Sprint (sprint user), they took my SIM card out to look at the Water Damage Indicator, and told me I was unable to turn in my phone and upgrade since I am missing this indicator. I have never had my screen replaced, I have never submerged my phone under water, sure ive accidentally got a few drops on my screen but never nothing major.
Is there any reason or explanation my phone is just missing this indicator?
iPhone 11 Pro Max, iOS 14