Hi,
Thank you for reaching out to the Google Ads API support team.
According to this earlier
blog post, "
In a given create/remove UserData operation, each set of user_identifiers should be for a single user". That said, and as seen also in the example from the blog post, multiple addresses can be specified as long as those are related to only 1 user.
Thanks,
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| Nirmita |
| Google Ads API Team |
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