Hello @MannersBFL, welcome aboard to the Fitbit Community!
My first recommendation would be to review the toggle of notifications is On. Fore more details please review the following post.
If the issue persist, please give it a try to the troubleshooting steps from this post: My tracker isn't receiving notifications (Android Fitbit app).
As an additional note, the Galaxy S8/S8+ has just recently been listed as supported and we are still working on some bugs with the S8 and are hoping to improve compatibility soon.
See you around and hope this information helps.
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