What button? I do not see it anywhere. Are you reffering to this site? https://egov.uscis.gov/casestatus/landing.do

or the https://my.uscis.gov/ ?

I am one of those who did not get an access code. When I go to myaccount.uscis.dhs.gov I create an account and without an access code and when I log into it it turns into https://my.uscis.gov/ where there is just basic information about USCIS and some tiles with different links on them.

Thanks