I am trying to download data from Universal Analytics (GA3) with the API.
I have downloaded different datasets, with different combinations of dimensions and metrics, in order to have a backup now that GA3 will be deleted for ever.
For certain tables, the API returns data from my desired starting date (which is 2021-09-25) but for other combinations, the data starts at another, later, date (2022-04-27).

For instance, for the combination of dimensions and metrics like

• dimensions:
  “ga:date”, “ga:sourcemedium”
• metrics:
  ‘ga:users’,
  ‘ga:newusers’,
  “ga:sessions”,
  ‘ga:bounces’,
  ‘ga:pageviews’,
  ‘ga:avgsessionduration’,
  ‘ga:transactions’,
  ‘ga:goalcompletionsall’,
  ‘ga:avgtimeonpage’,
  ‘ga:transactionrevenue’

I get the complete data set, but when I try to add a new dimension like “ga:campaign”, the dataset is truncated and it starts on 2022-04-27. It always starts on that date. In the Google Analytics platform there is data from september 2021.
It happens with any dataset that I try to download that contains more than 2 dimensions.
Note: I always need the ga:date dimension as part of my dataset.

The way I access the data is I make an API call for each day and try to get the data for that day and save it as a pandas dataframe. Then I concatenate all dataframes.

Anyone has some idea of what is happening?

I have administrator access to the GA3 property and view.

Thanks!