New iPhone 15, non-syncing Apple Watch, fitness apps record workout but no calories

Hi, got the new iPhone 15pro (upgraded from 12pro) and my problems start there with regards to my existing Apple Watch Series 7.

The main problem:

Even though my Apple Watch is listed with my devices, it would not pair with my existing Apple Watch. I had to restart and update the OS on my Apple Watch to the latest. When I opened the Apple Watch I could pair it to my phone with the blue 3D dust scan (the advanced moving QR code).

Now my iphone has recognized and paired with the watch, but as a new watch. And all my fitness data from my previous use is matched to the old version. I was seeing two devices in my find my app:

(1) Eirini’s Apple Watch

(2) Apple Watch

And then on my Apple Watch find my app, I only see Eirini’s Apple Watch and it says:

• with you 0m

i hit play sound and no sound is made on the Apple Watch. Now after erasing my old phone I see Eirini’s Apple Watch in find my on both iPhone and watch but the play a sound still does not work.

In my fitness app on my iPhone nothing is being tracked from the “new” watch for the past week. I see last data recorded from before I bought the iPhone 15pro. Then in the workout app on my Apple Watch I selected boxing and worked out for 30 min. Calories tracked: 0, exercise minutes: 0

I see that the workout happened on my Apple Watch but nothing on my iPhone 15. No rings are even getting tracked.

also, while I’m on wifi and it seems my Apple Watch is connected, many apps are still installing (this is for days). There are only a few apps on Apple Watch that are installed (like workout, heart, fitness rings, settings, iMessage, timer, phone).

Can you please advise? I’ve tried everything recommending in your other community posts (toggling location services, privacy items in the Apple Watch app in the phone, making sure Bluetooth is enabled, etc etc).

thank you,

Eirini