I have two apple IDs (which I wish that I could merge). A gmail email address that I use for the iTunes store and a me.com address that I use for icloud syncing. For some reason in the past I used my gmail account with iMessages. When I got my new phone today, I accidentally logged in to my me.com account for iMessage. Any time any of my friends responded to my old iMessages, I would get it on my ipad, but not my iphone 6. I logged out of my me.com login on iMessage on my iphone 6 and tried to log in to my gmail account. However everytime i try to change my Apple ID a dialog box pops up that says, "Enter the Apple ID password for email@example.com." I keep entering it correctly and then the dialog box reappears. After the 3rd attempt it will tell me that my password is incorrect. I am 100% dertain that I am using the correct password, and even logged out and back in to my iTunes account on my mac to verify. Any suggestions?