Smartwatch won't connect via bluetooth anymore

My mom tries to #bluetooth pair her smart watch and her phone. But every time she enters the correct validation code in her phone, the watch denies the #pairing.

her watch is a Suunto Peak 9 Pro
Smart phone is some Shift Phone 5 on Android edit8/edit
watch and phone have been factory reset
app has been reinstalled
watch to the latest firmware
phone bt cache and data have been deleted
phone network data has been reset
the watch can connect to another phone
her phone can connect to other bt devices

Any suggestions? What are we missing?
@android #boost #boostplease #teilen #followerpower

5 comments

Have you tried adding in the Suunto app, not directly from bluetooth settings?
There's some discussion of odd pairing issues here: https://forum.suunto.com/topic/9240/suunto-9-peak-pro-problem-connecting-to-phone-google-pixel-6/32
- @Kanzar Thanks for your advice. I know this link already, but we will try connecting via app once more.

@android I should mention it paired before the firmware upgrade

@dichotomiker @android
I encountered a similar problem with smart jewels. The app would only connect the device to BT after validation from a database on the manufacturers website. Since it was closed down connection has become impossible and our stock of jewels is scrap.

@android I used
adb logcat
and pinned it down to the error message
btagattcmarkbgconn unable to find the bg connection mask for: [...]
It matches well to this espressif issue: https://github.com/espressif/esp-idf/issues/5395
However, I don't know whether #espressif is involved in #suunto at all..