User credentials are asked for when running a report in Sandbox
Symptoms
When running reports in Sandbox, username and password are asked for.
Reason
This typically occurs when you ask for a Sandbox refresh from Production and exclude reports. In this situation, the reporting service is usually not restarted.
Resolution
Log a Support ticket for reporting to be enabled.
Additional notes
To prevent this situation, please ask for reporting to be restarted when you refresh Sandbox from Production and exclude reports.