Same thing happened to me . I have 2 yahoo accts connected with each other...one was inaccessible, so I changed my psswrd via the other acct. THEN the other acct did not work...changed that paswd too.
All seemed fine and sudenly, even tho I AM signed in, I got that stupid "access denied"note after I went on Yahoo home-page. Must be something up recently with either site glitch or hacker/phisher scheme cuz a LOT of yahoo people are complaining about this.
I recentl;y logged on after I'd set up a SIGN IN SEAL...was it a REAL sign in seal page OR a page to phsh my email? I also logged on before that had happened to my Flickr account.,.,.,often when signing into that site with yahoo,it gives a page to fill...then I do and then another yahoo log in page is there (so 2 pages which prompt me for my email!) and I close the 2nd one.
Anyhow, so if you had same experiences, this is what I just did to access my supposedly "forbidden" access-denied own page which I am already signed into.
Do not sign in again. I did this yesterday and my password no longer worked --got stolen and changed...email got hijacked.
What I just did here was NOT sign in again but, rather Google-search "Contact yahoo" and go to that Yahoo help page...and on the right hand side of that page, it says Your ACCOUNT settings (or something like that--I can't remember exactly) ...click on that. It opens a new window for your site settings. You'll be IN your account. (still signed in like u were before this "access"-problem happened) Then, click on the mail envelope-icon on the top right hand corner of THAT page and it takes you right into your supposedly "forbidden" / inaccessible email.
At least that is how I just did it. I was able to read and send emails as before. NO need to--
"update the yahoo - profile" as a few users suggested
Good luck and something's definitely UP with Yahoo these past couple days. My problem with it began around 4pm yesterday afternoon- writing from Ontario
same problem with my yahoo acct.