cant add a phone number to my steam account?

[squam]

when i go to account details, and look it says it says "add phone number" instead of "manage" implying that i dont have a phone number on my account HOWEVER i do have the steam guard


so i go through the process, do everything, but when i get on my phone and click the link steam sends me through my email, my steam guard (on the mobile app) says something along the lines of "This account already has a steam guard on another device" even though my phone is literally the device that has it, ive always had problems with the steam guard and phone numbers, so my question is, do i have to add a phone number if i have the steam guard? or does my steam guard already have the phone number or something