This article explains debugging issues regarding missing data in the Analytics Power BI reports. There can be multiple reasons for missing data and these are explained, step-by-step.
Azure Data Factory
The first thing you need to make sure of is that the Azure data factory (ADF) is running without any errors. If there is no error in the ADF, move on to either the LS Central source On-premises or SaaS troubleshooting, depending on which scenario you are dealing with.