Setup a Google Ads BigQuery Transfer but shows empty tables

I've setup a Google BigQuery Transfer to transfer Google Ads (formerly AdWords) data. The transfer job is successful and shows no error.

Summary: succeeded 87 jobs, failed 0 jobs.

However, I went over to the Datasets and saw a lot of views and partitioned tables. But none has any data.

I've read through all the documentation on https://cloud.google.com/bigquery-transfer/docs/adwords-transfer#migrating_google_ads_data_to_mccs, but couldn't figure out where went wrong.

Anyone has similar issue?