When attempting to import a Nintex Forms & Workflow license via Central Administration > Nintex Administration > Licensing, a read banner stating "Workflow license not imported because license is invalid" appears and the license fails to import.
Sharepoint 2016 (on-premise)
run from SharePoint Management Shell:
NWAdmin.exe -o UpgradeDatabases
the same result “Workflow license not imported because license is invalid”
What can I do ?