Javascript Release Health and Crashes

We’ve been following the doc and tried to set up Release Health to view crashes for our Javascript app. However, it seems like some of the options are still disabled and crashes always shown --.

Does anyone know what did we miss?
some details:

  1. we are using latest SDK 6.x.x
  2. we are having a self-hosted sentry instance

Screenshot 2021-03-22 at 15.08.56