Annotations added with HTTP API only displaying in one (of two) orgs' dashboards

Grafana v6.1.4 (commit: fef1733)

I have two orgs in my Grafana database. There is one global admin user. Each org has a dedicated admin and a “read only” user. (total of five users)

Using the Annotation HTTP API, I added annotations that should display on dashboards from both orgs. But, I notice that the annotations only appear for one org but not the other.

The HTTP API command that I’m using to insert the annotations looks like this:

curl --silent --request POST \
      --url "http://localhost:3000/api/annotations" \
      --header 'authorization: Basic <redacted>=' \
      --header 'content-type: application/json' \
      --data '{"time":1575676800000, "tags":["release"], "text":"19R3"}'

I don’t see anything in the API that would limit the annotation to a single org. Can anyone tell me what I’m missing?