UNIs are assigned and administered by Columbia University Information Technology (CUIT) to access email and many other resources and services.
To activate your UNI, reset your password, look up your UNI by name and manage your UNI Account: https://cuit.columbia.edu/cuit/manage-my-uni
Please note that Teachers College members authenticate through Okta for access to TC electronic library resources; you may need to use your Columbia password to access resources available through Columbia University Libraries.