I cut and pasted the MAC address from my router, so it should be fine, although I’m wondering if it’s case sensitive. There are some small letters on the WeatherFlow MAC address, but when I pasted them into Ambient Weather they turned into capitals.
Ambient Weather is running their own private sandbox PWS site, using an upload protocol that resembles WU’s old rapid-fire. AFAIK, it only works with hardware that they sell, including their Ambient-branded version of MeteoBridge. If WeatherBridge has Tempest support, that may be a way to upload data into the Ambient ecosystem. I never used it, and don’t know what storing data in their proprietary platform gets you in the long run…