trying to open my purchased ebooks in ADE and keep getting message "the vendor account you entered is not associated with the item you are trying to open" even though it is the same Id

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trying to open my purchased ebooks in ADE and keep getting message "the vendor account you entered is not associated with the item you are trying to open" even though it is the same ID and password I have always used, any suggestions would be great as 140 of my ebooks are now locked with DRM message