Fixing bugs like "We cannot convert the value "[Table]" to type Table."
me@jaykilleen.com wrote this about 7 years ago and it was last updated about 7 years ago.
I followed the post over at the PowerBI Documentation to Enable Fast Combine
C:\Users\KilleenJ\AppData\Local\Power BI Gateway - Personal\2.0\Configurator\ConnectorConfig.xml
<?xml version="1.0" encoding="utf-8"?>
<AgentConfiguration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<AzureActiveDirectoryConfiguration>
<AuthorityAddress>https://login.windows.net/common/oauth2/authorize</AuthorityAddress>
<ResourceAddress>https://analysis.windows.net/powerbi/api</ResourceAddress>
</AzureActiveDirectoryConfiguration>
<PowerBIConfiguration>
<GlobalServiceEndpoint>https://api.powerbi.com</GlobalServiceEndpoint>
</PowerBIConfiguration>
<MicrosoftDownloadCenterConfiguration>
<DownloadUri>https://go.microsoft.com/fwlink/?LinkID=522228</DownloadUri>
</MicrosoftDownloadCenterConfiguration>
<AgentInstallationConfiguation>
<AgentType>PowerBIPersonalGateway</AgentType>
<AgentInstallationMode>PerUserMode</AgentInstallationMode>
</AgentInstallationConfiguation>
<EnableFastCombine>true</EnableFastCombine>
</AgentConfiguration>