AdMob API (mediationReport.generate) returning manager account app data instead of MCM child publisher data

[Jay Cho]

Hello,

We are currently using the AdMob API to collect mediation report data, and we are experiencing an issue when querying data from MCM (Multiple Customer Management) child publisher accounts.

Environment

• API: AdMob API v1

• Method: accounts.mediationReport.generate

• Authentication: OAuth2

Structure: Manager account with MCM child publishers

Issue Description

When requesting mediation reports using the child publisher account ID (pub-xxxxxxxx), the API does not return the mediation data of the child publisher.

Instead, the response contains data from apps connected to the manager account.

In other words:

• The API request is made with a child publisher account ID

• But the returned report contains apps belonging to the manager account

This behavior started recently and was not happening previously.

Dimensions 
DATE
AD_UNIT
MEDIATION_GROUP

Expected Behavior

When querying with a child publisher account ID, the API should return mediation report data for the child publisher’s apps.

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Actual Behavior

The API returns mediation data for apps belonging to the manager account instead of the child publisher account.

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Additional Notes

• OAuth authentication is working correctly.

• API calls are successful (no error response).

• The returned data appears valid but corresponds to the wrong account.

• The issue occurs only for MCM child accounts.

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Question

Is there any known issue or recent change related to:

• AdMob API and MCM accounts

• mediationReport behavior for child publishers

Any guidance would be appreciated.

Thank you.

[AdMob API Developer Forum]

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,