If your institution uses Google Workspace for Education and you encounter the following error when attempting to log into JSTOR:
Access blocked: Your institution's admin needs to review jstor.org
This can be resolved by your Google Workspace administrator. In the Google Workspace Admin console, administrators can review and approve third-party apps users designated under 18 have requested access to.
Please see Google's support article regarding Managing access to unconfigured third-party apps for users designated as under 18 for more information.