I came back to find I had 10 coalition messages but I can't find any of them in coalition chat, newspaper or diplomacy. I'd like to know what my coalition allies said, please.

I did and it still says "Coalition message received" ten times but there are no messages in coalition.

I found the issue and it's not a bug. However, it is confusing to have so many ways of communication. It would have helped if the notices had told me where the messages were.