Charge 5 SpO2 disappeared and says need to install app

[Fujisan54]

Upon waking this morning I noticed that my Health Metrics has gone through what looks like an entirely unnecessary cosmetic change. But the Sp02 now doesn't show and when I tap it, it says that I need to install the Sp02 app, whatever that is. Anyway tapped through to a page that's says Sp02 app not available for my device (Charge 5). Has been absolutely fine up until now with no extra app installed - what does any of this mean? My fitbit is up to date and I use the normal app daily and until now Sp02 has shown every day. Why the change?

Moderator Edit: Clarified subject

[PTutie]

I had this happen once before and had to totally delete and reinstall as if I've had a new charge 5. This is ridiculous and causes a lot of time-consuming effort to get the reading back on that has existed for years on my trackers. 

[SMurph35]

I purchased a new device. Didn't have time for all of this BS and getting
no reply from fitbit.

Life isn't about waiting for the storm to pass....
It's about learning to dance in the rain......

Moderator Edit: Personal info removed

[RiekoC]

Hello @MikeC. 

To find your app version number:

• Tap on your picture/avatar in the upper right of the Fitbit app
• Tap on Help in the menu that opens
• The Fitbit app version number will be on the page that opens

[Jep1138]

Sometimes, you can restart the Fitbit device and the new app will download.