Afaik with Homey it’s split into systems: chromecast enabled devices need the “Cast text to google app” to broadcast announcements,
(I think the right description is: “Broadcast to all google devices”)
apple needs an other app (no clue).
I think you’ll need to use 2 flow cards to create google + apple broadcasts.
I use both Homey (2019) ánd HA btw, both have unique features, and both lack unique features; find an integration tutorial here.
