Never show again storage keys are registered for syncing after the notification is shown. This is too late because the corresponding state is only synced (pulled) after the keys are registered and because of this these notifications are shown on other machine.

For example try out

• On first machine, Install a language pack on one machine
• When the prompt comes, choose not to show it again
• On a second machine, enable sync

🐛 Prompt is shown

@bpasero
Probably this a new kind of key for which state has to be synced always. I would probably introduce a new kind of keys called non-versioned which gets synced always. It means you do not need to provide version while registering.

Edit: I do not think above solution works as it only fixes for the dialog which will be shown after. Existing dialogs which are asked not to be shown will not be synced because their keys will never get registered. All do not ask keys shall be registered outside notification service by respective owners always.