Why is my create report button greyed out?

In Black Ghost 6.5 the reports option is enabled when you set a Core Temperature Estimate (CTE) alert threshold. This is because the report contains heat strain insights.

You can set CTE Alert thresholds subject by subject and you can also set a default threshold for your account as Admin using the Alert Settings and Thresholds option in Preferences.

Logged in as Admin, go to Preferences

Then go to Alert Settings and Thresholds

Then set the default CTE Alert Threshold