Just general commentary for those reading. The NEX uniform portal is hitting DEERS which is where your DOD digital identity originates from. When you log into that uniform section it is hitting DEERS and validating if you exist in the proper status. When you onboard as DCO your first status is IRR because you have not been gained into a paid status via your NOSC and had initial IAP orders cut. At this point, you can get an IRR ID and use base privileges. When your IAP orders are cut ( for me it was a few months later) you will change from IRR to SELRES and can get a CAC and start using other access types (mainly IT related)
If you want to log into DEERS and see your status now click the new user in the top right corner of MilConnect and create a DS Login.
https://milconnect.dmdc.osd.mil/milconnect/
While your at it create a Troop ID at ID.me as well, that is a growing military authentication/validation service on the commercial side.