mediationReport:generate returns empty response (header + footer only) for all MCM child accounts since ~March 11, 2026

熊倉一哉

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Mar 17, 2026, 10:48:55 PM Mar 17

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Hi,

We have been using the AdMob API (`accounts.mediationReport.generate`) to fetch mediation report data for our MCM child accounts (52 publishers), and it had been working fine.

However, since around **2026-03-11**, the API started returning only a header and footer with **no row data** for all accounts.

---

## What doesn't work
- mediationReport:generate returns HTTP 200 with header + footer only (no `row` entries)
- Affects all 52 MCM child accounts and the parent account
- Affects all date ranges , including historical dates that previously returned data
- Affects all dimension/metric combinations , including minimal requests with only `["IMPRESSIONS"]` and no dimensions

## What still works
- AdMob console (UI) shows data correctly for the same accounts and date ranges — the data exists, but the API does not return it
- `networkReport:generate` returns data correctly for the same accounts and date ranges
- `accounts.adUnits.list` returns ad units for child accounts
- `accounts.apps.list` returns apps for child accounts
- `accounts.list` returns the parent account
- OAuth token refresh works correctly

## What we have verified

- Tested with 4 different refresh tokens (re-authorized via OAuth Playground)
- Authorized with the Administrator account
- OAuth scopes: `admob.readonly` + `admob.report`
- AdMob API is enabled in Google Cloud Console
- OAuth consent screen is in production mode
- Added AdMob scopes to OAuth data access configuration (no effect)
- No API errors in Google Cloud Console (all responses are 200)

## Example request

- POST： https://admob.googleapis.com/v1/accounts/pub-XXXXXXXXXXXX/mediationReport:generate

{
"reportSpec": {
"dateRange": {
"startDate": {"year": 2026, "month": 3, "day": 1},
"endDate": {"year": 2026, "month": 3, "day": 1}
},
"metrics": ["IMPRESSIONS"]
}
}

## Response (same for all accounts and dates)

[
{
"header": {
"dateRange": {
"startDate": {"year": 2026, "month": 3, "day": 1},
"endDate": {"year": 2026, "month": 3, "day": 1}
},
"localizationSettings": {"currencyCode": "JPY"}
}
},
{
"footer": {}
}
]

For comparison, `networkReport:generate` with the same account and date range returns data correctly:

[
{"header": { "..." : "..." }},
{"row": {"dimensionValues": {"DATE": {"value": "20260301"}}, "metricValues": {"IMPRESSIONS": {"integerValue": "659777"}}}},
{"footer": {"matchingRowCount": "1"}}
]

---

This appears similar to the issue reported in [this thread]( https://groups.google.com/g/google-admob-api-developer-forum/c/32LRCEhZWM8 ) where a buggy change caused `mediationGroups.list` to return empty responses (December 2025).

Could you please investigate if a similar change has affected the　mediationReport:generate endpoint?

This is blocking our daily reporting pipeline and we currently have 5+ days of missing mediation data .

Thank you.

AdMob API Developer Forum

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Mar 17, 2026, 10:53:07 PM Mar 17

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Hello,

Thanks for reaching out.

Can you please check again now and confirm if the issue still persists?

Most probably, we had a auth related change that only impacted MCM use case. The issue should be resolved by now.

Thanks,

熊倉一哉

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Mar 18, 2026, 3:48:10 PM Mar 18

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Hello!

Thank you for the update.

I have just checked, and I can confirm that the reports are now being generated and retrieved without any issues. It seems the fix for the authentication change has successfully resolved the problem.