Usually, you need an ID from Adobe.
You can get that by registering at www.adobe.com
Go to 'sign in' near the top right, and it will lead you through registering an ID.
(You may already have done that to use this forum.)
Some book vendors use their own IDs; these have different formats which they don't always make clear.
I understand some use the email you use for that vendor, plus the credit card number you have registered with them as password.
Either contact the vendor, or post here who the vendor is and somebody may be able to clarify how their IDs work.
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