"message": "Cannot run the report execute the report once in the UI",
A custom report must always be manually run through the UI after it has been configured before the reportsExecute API can be called. This is to ensure that various details about the report which are determined and configured when it is run through the web UI are available for when the API is called.
When some types of Flexera One IT Asset Management maintenance activity occurs, these details may be removed. If the report is not run in the web UI prior to the API being called again after the maintenance activity has been performed then the API may fail as described above.
Use the web UI to execute reports that are executed through the API after Flexera One IT Asset Management maintenance activity is performed.
You can subscribe to receive notifications when Flexera One IT Asset Management maintenance activity occurs on the site https://status.flexera.com/.
This issue has been fixed in the following FlexNet Manager Suite release: 2022 R2.1 / Jan 2023 (Cloud)