Adobe Reader DC not picking up licenses

Hi all,

I have just got 17 Adobe licenses but when I assign them to some users sometimes they aren't getting the license once they have signed into adobe and installed the Adobe Reader DC software, for some users it works straight away and the Upgrade box appears as soon as they sign in for others it takes a restart and I have had a few users that it has not shown at all for.

The steps I take when installing-

-License users in Adobe Admin Portal

-They receive setup email and sign in with Adobe ID they just created

-Install creative cloud/Adobe Reader DC

-Sign into Adobe Reader DC (some users get the upgrade box others don't as stated before)

Anyone able to shed some light on this such as why, how to fix and how I can gaurauntee everytime they sign in I can get the upgrade to work relatively easily.

Thanks,

Wudwo