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Updating the Power BI Template files (.pbit) can be tricky and must align with changes to the PowerShell data collection process. Power BI also has a Data Privacy Firewall which prevents accidental data leakage between data sources. This firewall can sometimes prevent our assessment templates from loading when a query combines or joins data from multiple files, for example, oauth2PermissionGrants.csv + servicePrincipals.json. In our case, all the data sources have the same privacy level which should allow them to be combined but Power BI may still prevent loading with the following error: Query 'Query1' (step 'Source') references other queries or steps, so it may not directly access a data source. Please rebuild this data combination.
One option to avoid this error is to turn off the Data Privacy Firewall by setting Power BI Desktop privacy level to "Ignore the Privacy levels" when the template fails to load the data.
However, in order to avoid changing this setting whenever the template is instantiated, we can "rebuild this data combination" to avoid the firewall restrictions by introducing a proxy function for each data sources used in the combination query. You can see some examples of this in the existing templates where queries will reference f_oauth2PermissionGrants() and f_servicePrincipals() which are proxy functions for the oauth2PermissionGrants and servicePrincipal data source tables rather than referencing those tables directly.