Hello Steve,
Thank you for your question.
The Security administrator role grants users access to perform several key actions in the Security workspace. You only need this assignment to perform several key actions in the Security workspace. Kindly Ensure that the role assignments are correctly configured for the User. Note that Role assignments or changes you do in Azure portal can take up to one hour to appear in Partner Center.
If the issue persists, consider reaching out to Partner Center support for assistance. They can help ensure that your roles are correctly configured and troubleshoot any access issues. https://learn.microsoft.com/en-us/partner-center/support/report-problems-with-partner-center
*
If you find the answer above helpful, please Accept the answer to help anyone in the community who might have a similar question to quickly find the solution.*