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Hah ! me too, iMore does this to me at least once a week. It tells me I have to log in and then refuses my password, and at the same time tells me that I have tried to do this ( log in) five times with the wrong password ( I have not !) and to wait 15 minutes. This will be pointless because the app will not accept your password ! At the same time an email will arrive telling me that someone has tried to access my iMore account with the wrong password at the exact time I tried to log in. The curious thing about this is that the IP address given in the email as the originator is never mine ?
At the risk of being dull I will say that I have found recently that if I go to the iMore website and access an article,wait a while and then go back to the app it will accept the passcode !!! To finish I will say that this only happens on my iPhone which is weird because I joined iMore on the iPhone.
My apologies, I must have been confused, neither my iPhone or iPad do that ?