We were looking for a ways to notify our Adobe product users of upcoming changes, such as moving to SSO/Federated IDs. If a user doesn't receive or see an email announcing this, when they're logged off and go back to log in they could see a banner we put up. Can be used for contract and product changes, etc.

Not related to Acrobat, it's for overall Adobe. Chat Support advised that it isn't currently possible and referred me to submit a feature request on this site, but there's no option for general, admin console, or administration so I picked our most used product.