Internal Server Error on watch.samsung.strava.com at first boot of app on samsung watch

Hi

I have reinstalled my Strava app on my Samsung Gear Sport AB91 SM-R600 .

This because I got a new non-Samsung cell phone and Samsung forced me to reinstall it Strava App on Watch. Tizen OS  4.0.0 7 Knox 2.3.1 TIMZ 3.0.0

At first boot of the Strava  app (1.7.24) I see that I need to type in 4 digits, for authentication.
On my mobile phone ( having connected the Samsung Galaxy Wearble App) the app redirected to  https://watch.samsung.strava.com/ 

which shows:

{"message": "Internal server error"}

Why is this msg seen?
Also is there anywhere else I can get those 4 digits from ? ( from another than the web site that respond HTTP500) .
So that I can continue to use Strava on my Samsung Watch Gear.

I have no problem with any other Samsung apps*  on my cell phone, nor on my Gear Watch.
I only have problem with the Strava app, on the Gear Watch.

*(nor account problems after creating a password - because there were none initially as it was created on google initially)

Thanks for any ideas,
Usain Bolt