Cannot sign in to my account ...I tried to sign in a couple of months back. I could not , now up against the deadline I am trying again. what is up?

Nothing we users can do.

1))  Either create a new account and enter all from scratch  (you might have to mail in f you don't know last year's PIN or last year's AGI)
or.
2)....call Customer Support and see if they can direct you as to the proper procedure to re-open the old account:
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You are likely using the wrong User ID or password.   Try the steps to recover your account that I outline in my answer below.   There are 2 ways to do it.  If the first method fails, I've also included a "Try something else"  method that looks you up a different way, by SSN.

Oh, if you have had made several attempts, it might lock the log-in for a while.  You may have to wait an hour or so to try again.   I don't know if the Account Recovery tool will bypass that part or not.

Good advice to try again...maybe epo has a way you haven't tried yet...

You may have ended up with multiple accounts or messed up the password.  This is one of the more common questions in the forum.   We can tell you how to check all your User IDs and recover access.

You can have up to 5 accounts that use the same email address for notification purposes.  A User ID may be an email address, but it doesn't have to be.  It might be only part of an email address, or it can be anything at all.

To get a list of your User IDs and recover account access, you can use the tool at the link below.  Try using your phone number first.   After that, if necessary, then run the tool on your email address(es) you can access.

NOTE: Before running the account recovery tool below, log out of all Intuit accounts including this user forum, or you might end up in a loop.  Then clear your browser Internet cache, close your browser, then reopen it, and go to the link below.  You may wish to copy this link so you can paste it into the new browser session.

https://myturbotax.intuit.com/account-recovery

If still no luck after running that on your phone number and email address(es) that you can access,  here's another method.
Go back to the tool again, but this time leave the data field blank, and choose the small blue link that says "Try something else", and it will look you up by SSN and other parameters.