NSX UI banner error message:
NSX Manager was licensed with <NSX license>, which is not a valid license in this version of NSX. To rectify this situation, please verify NSX Manager''s valid license or VMware Cloud Foundation license within the next {<number of days>} days. NOTE: This banner will persist till the countdown expires even after addition of a valid license. Please check NSX Licensing UI to verify license validity.
NSX 9.0
Product license keys from prior releases in not supported in NSX 9.0.
Remove the unsupported license keys from NSX UI - System - Licenses page.
Note the banner will persist till the countdown expires even after addition of a valid license.