vertex search import from big query errors out with missing ID field

[benrigby]

Hi - just trying to import a BQ table into vertex search as a data source, but it's erroring out with the following error:

BQ table (project_id: pink-stage, dataset_id: pinkdocstest, table_id: fiann) Missing field id with type STRING and is in REQUIRED mode

Where my BQ table does have an id field... 

any thoughts?