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but still we need it for single sign on with SAP which is case sensitive.This is still not an AD issue, because AD is not case sensitive.
Is there a way to enforce the newly created usernames to be all lowercase?YES, there are options for enforcing this
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To AD; username, USERNAME, UserName are all the same identifier.
There are tools available but they cost money, e.g. https://www.netiq.com/issues/data-integrity.asp
Other Identity and Access management tools offer similar capabilities.
Any reason for this request?