Aren't Ambient Weather the ones that market the rebadged WeatherBridge and then offer subscriptions to upload to their system?
Yes but backwards- I think it's metrobridge > Weatherbridge
I contacted Ambient support- they are not sure what is wrong but are looking into it. Not a super big deal as primary reason was to use for cwop and it is working fine. Well fine as uploading and showing up on aprs.fi and find.u etc. Still have to make sure my data is correct.
Before anyone laughs at my choice, I will say that reasons I went with Weatherbridge over Metrobridge was because:
After reading this forum for the last month I came to the impression that Ecowitt would not be where they are today without Ambient as a customer so that is my way of giving some support.
It's also "ready to go" where the PI version requires an industrial SD card and I thought that would take a month to get that in. Well I come home about 10 min ago and find it's waiting for me. That's ok nothing wrong with having a backup 
I'm not sure you have fully understood the Meteobridge/Weatherbridge concept and its history. Apart from the repurposed routers all other versions of the Meteobridge (and Ambient took the repurposed router version as their first Weatherbridge and nowadays the Meteobridge Pro2 as Weatherbridge Pro2), all MB appliances plus the RPi variant need industrial SLC storage - and that for good reasons - because most other SD cards do not survive the frequent write I/Os to the database for a long time.
Complaining about the need for an industrial SLC SD card shows not proper understanding.
By the way, the new MBPro2/WeatherbridgePro2 comes with a 16 GB industrial SLC SD card - ooops.
The Ambient invalid issue is on the Ambient end. It's not the first time that this happens. When you can show that it's a valid Ambient purchase, Ambient support will (have to) sort this out for you.
When they sell the piece, the MAC address of the machine qualifies for an Ambient license. With a RPi you can buy this license in addition to the Meteobridge license if you find that being allowed to post to ambientweather.net is worth it. (Ambient do not sell the MB on RPi version - even though it's the solution with the highest performance, if performance is an issue). For just one little Ecowitt weather station with basic sensors only, that would properly be technological overkill.
And regarding the Weatherbridge - Ambient is just a reseller for a splendid product under their own brand name. Apart from putting their brand name on it, there is no merit from the Ambient end involved.
That's another historical misunderstanding - that it was Ambient who made Ecowitt big - the other way around would be more appropriate - even though Ambient do not sell Fine Offset / Ecowitt clone weather stations only. Only when the tail wags with the dog this narrative works.
