My Fitness app is not updating in my Apple Watch

I can confirm this. It has been going on for 5 months for me. Multiple support people - I think I've been through 5 on my ticket - diagnostics and logs captured, shared with engineers. Apple acknowledges a problem, no indication or promise if it will be fixed.

What you might see:

• Apple Watch is paired properly, Fitness is recorded and shows on the phone in Activity for several days ... and then, one day, randomly, it just stops showing the activity in Activity on the phone. It just stops. The watch is still properly paired
• restarting the phone and watch at this point DO NOTHING
• You know you have the problem if you go into the Watch app on the phone, choose General - Software Update or General - Usage - and it times out. Yet, the Watch is still showing as properly Bluetooth paired

The ONLY way out of this is to reset / unpair your watch and pair it again.

I am MASSIVELY disappointed with Apple's support on this issue since it has been going on since March. I've alerted them with detailed screen shots, logs, phone calls, diagnostic reports. And still, no timeline.

For now, don't rely on the watch for Fitness tracken. It's awfully broken.

(If there is any Apple lurker who gives a s*** and the poor quality response, I have a case number.l

If it is a new watch, it comes with a 90 warranty that includes Apple Support and can be returned within 14 days for any reason:

Returns & Refunds - Shopping Help - Apple

"If you purchased your item from Apple in the U.S., you can take it to any U.S. Apple Store for an exchange. Item exchanges are, of course, subject to in-store product availability. It's a good idea to check if a product is in stock by visiting apple.com and then seeing if it's available for pickup at a store nearby."

I doubt a hardware issue would cause that type of behavior you can contact Apple support for a diagnostic run on the watch and also when you set up the watch from the unpaid are you restoring from a backup or setting up as new? If you are restoring from a backup I would most definitely attempt to set up as new and see if issues persist.

Set up your Apple Watch

https://support.apple.com/en-us/HT204505

Contact Apple for support and service - https://support.apple.com/en-us/HT201232

I believe I'm having a similar issue, see my screenshot below. Is this the same as your problem? It started just a few days ago and I cannot figure it out. I've tried un-pairing the watch, signing out of iCloud on my iPhone, as well as resetting both iPhone & Apple Watch as new devices. I guess the next step is heading in for Genius Support. So frustrating.

Actually it comes with a 1 year warranty and 90 days free phone support.

Just spoke with Apple Support. Evidently this is a known issue, related to Apple ID. They are working on a fix that will be issued in an upcoming update.