Currently the Badge Counter is not synced across different installations. e.g. if new messages are pusehd, then the Badge Indicator will update.
But when I read messages on a different device (e.g. PC, Tablet, Mobile), then the Badge will not get updated on other iOS Devices unless I open the Webex App on that Device.
I think this is not a good implementation for an Enterprise Application.
Other tools like Whatsapp, Signal or even MS Teams do not have this restriction.
I found an additional problem with iOS:
If you get invited to a new space or there is a message in a very old space where the Key is not cached anymore, then the Notificaion is only shown with "Title" + "New Message" instead the content of the message.
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This is a problem I have too. I work from my desk and then when I get up to roam the office I think I have a ton of messages when in reality I don't.
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