Showing Error - 300 on watch when trying to get code

My Garmin Venu 2 is showing Error - 300 when I try to get a registration code

Hi, that’s a network timeout, which could be either our site or your network.

Could you retry again and see if it has started working, otherwise disconnect and reconnect your watch from your phone.

If that doesnt work, we can register it manually. I presume this is the email you used to register?

David