Can't log into UnitedHealthcare Medicare Supplemental site

Didn't know you could use the insurers site for Medigap plans - I always use my Medicare account since Medigap claims should be forwarded to the Medigap plan by Medicare once the claim is completed by Medicare - since that is all that they pay - the 20% that Medicare does not cover.

I'm having the same issue.  Been on the phone with 4 different agents now for over 2 hours.  They have no idea why.

Same here. Just signed up for AARP Medicare suppliment plan and I cannot register my account with UnitedHealthCare online. My Medicare number is not accepted and they cannot find me in their system. Is this a bug in their system? Please fix your website.

thanks, Phil

 I too have the same error  (Error Code:10002) User Not Eligible: We're having trouble finding you in our records. Please check that your entries match the information on your health insurance ID card. Also several other errors. AARP UHC does not work as a normal internet site should. It basically likes to play for example I input user and password and is accepted if it was not it would not verify it knows my phone number however text messages were not sent however now sending a text is the only thing they fixed. Then after verified it is more information to give and the errors they make in spelling it writes be sure its all numbers yet the information to give is a numbers and uppercase letters for example (5gh-67-hjj7...) and computer does not accept my ID on my cards I have called them and chat with them on computer and phone still can not get the information straight however there are several times it was accepted and gave me 43 character string  for example however not the same one HSID_SSO_75b- bbfa-4469-8d41-ec0ea3-3df105 and calls it a health safe ID and needs the password again remember its the same password I was verified with however password fails. Amazing however I got in 2 or 3 times to find my account is shared with another person with the same name that lives in another city I see his list of drugs and his doctors however I was told its old data it goes back near 5 years or more. Sensitive information. I tried getting it fixed and then someone appears on the phone and says here I am about locked account then disappears with out helping not just once but twice. I used password reset it does not like the password I tried to use however in reset it calls it old password however the password it refused to accept. However at another internet site if it was not accepted it is now accepted as a reset password and works.   

I had something similar happen once and it turned out my info hadn’t fully synced in their system yet. Super annoying, but calling support got it fixed way faster than fighting the website.