Problem summary
You connect a Microsoft Advertising source in Funnel successfully, but the source retrieves no data.
Error message or symptoms
The connection succeeds, but Data Explorer shows no data for the Microsoft Advertising source.
When does this occur
The credentials you used can connect to Microsoft Advertising.
The Microsoft account behind those credentials doesn't have access to the specific account or campaigns you want to import.
Root cause
Connecting to Microsoft Advertising and reading campaign data need different permissions. Your credentials have permission to connect to Microsoft Advertising, but not to access that specific campaign data, so Funnel has no data to retrieve.
Solution
Choose another pair of credentials that has access to the account and campaigns you want to import, and connect again.
If none of your credentials has that access, create credentials with a Microsoft account that has access. For the steps, see Microsoft Advertising: Connection guide.
Check Data Explorer again to confirm that data appears.