I am using FCM to send notifications to mobile devices using topic subscriptions.
When I send notifications to a topic, for example: “‘A’ in topics”, it works fine and notifications reach Android and iOS devices, but when I try to avoid duplicate notifications and use operators, for example: ‘A’ in topics | | ‘B’ in topics notifications only reach Android devices, not IOS devices. The same goes for the && operator.

Is there a solution to send these notifications to ios devices and avoid, in my case, duplicate notifications to the device subscribed to more than one topic?