Getting "This app iOS no longer shared with you"

[Mikeoco]

When I try to open Fitbit on iPhone, I receive message :" THIS APP IOS NO LONGER SHARED WITH YOU.  To use it, you must buy it from the App Store".  

 Going to App Store and try reload I get the same message.  

REASON????????????

Moderator Edit: Clarified subject

[Odyssey13]

This is at the top of the page of the forums:

"We're aware of an issue affecting customers who update to iOS 13.5. Uninstalling and reinstalling the Fitbit app may resolve the issue. Thank you for your patience!"

[Mikeoco]

That worked. Plus my watch changed to 24 hr time which I have been wanting for ages. 
many thanks. 

[Odyssey13]

Good news @Mikeoco