(You want the general discussions forum. A moderator should be by soon to move the thread.)
OverDrive books should be able to be checked out to any Adobe ID, assuming they haven't already been checked out with another ID.
What do you mean by "the authorization for the 3M gateway"? I thought 3M Cloud uses whichever Adobe ID is configured in ADE.
What exactly do you see on the authorization screen?
If you really want to deauthorize, you can try uninstalling ADE using Revo Uninstaller, which should clean up the authorization from the registry as well, and then reinstall and sign in. It is a bit of an extreme solution though.
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