iTunes Producer not accepting my Apple ID and password
I have created an ebook in iBooks Author. I downloaded iTunes Producer. I went through the steps in the Publish dialog of iBooks Author. I submitted a publisher's application to Apple, which was approved.
The approval email said,
"Your application to distribute Book content on the iBookstore has been approved. Next steps include agreeing to contracts and delivering your content. Visit iTunes Connect to set up your account or sign in to get started."
I visited iTunes Connect and signed in with my normal Apple username and password.
Following the steps in the Publish dialog of iBooks Author, I was switched over to iTunes Producer. I get to the screen where I am supposed to sign in with my iTunes Connect account. It asks for my Apple ID and password. I enter in the same Apple ID and password that worked fine for iTunes Connect, but iTunes Producer says:
"There is a problem with your login information. Please click Back and try again"
I only have one Apple ID and password. I do not understand why it is not accepting it.
iMac, Mac OS X (10.7.2)