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The supported timezones list is at [https://developers.google.com/google-ads/api/data/codes-formats#timezone_ids](https://developers.google.com/google-ads/api/data/codes-formats#timezone_ids), should be used instead of `insert_timezone` (a 4-digit offset with sign should work too)
Or you can use Able CDP or something similar, which would also handle things like retrieving associations between caller numbers and click IDs from CallRail and sending these GCLIDs to Google for phone-only CRM conversions
