BigQuery BI Engine is Missing US-Central1

Question

The Docs for the BigQuery BI Engine say "BI Engine is supported in the same regions as BigQuery" (https://cloud.google.com/bigquery/docs/bi-engine-intro). Also I can see that in the release notes on 2021-01-19 that it says that both BigQuery and BI Engine are now available in us-central1 (Iowa) https://cloud.google.com/bigquery/docs/release-notes#January_19_2021

But when I go to make a reservation, it's not available in the region dropdown. Here are the US regions listed

• US (multiple regions in United States)
• us-west1 (Oregon)
• us-west2 (Los Angeles)
• us-west3 (Salt Lake City)
• us-west4 (Las Vegas)
• us-east1 (South Carolina)
• us-east4 (Northern Virginia)

Is the any workaround?

I tried running this in the console:

bq update --reservation=true --bi_reservation_size=2 --location=us-central1 --project_id=<Project ID>

I get a response that looks like it went through, but when I go to check, it's not listed as a reservation, and when I view recent query jobs they say that BI Engine is disabled with the reason being there's no reservation.