You have installed your Nexus Professional license and are trying to use the repository health check search extras Component Info tab by searching for or using the Browse Index tab for a repository. After selecting an open source component, and then the Component Info tab you receive a message stating Error accessing Sonatype server: Professional license is required for access to this data.
The Repository Health Check search extras features rely on running at least one successful repository analysis after the Nexus Professional License is installed.
In your repositories list, click the Analyze button on at least one Proxy Repository containing open source components. When the analysis is complete, the Component Info tab should start displaying data as expected.