@jtmckown my station is registered with the weather underground and it works just fine reporting weather to WeatherMate.
Weather Mate Pro Version: 7.6.1
Device Type: iPad Pro 12.9" Wifi
iOS Version: 15.4.1
Device Language: en-US
Screen Mode: Advanced
Location Services: While using the app only
Notification Permission: Alert, Badge, Sound
Token = 3ac9fec786cbffc2a08e91dbe9860f56743f4e8d3501bc7ba41a3c728a02fa18
DDID = 2BF5306D-D516-4411-8DBB-1D5AD0CEE6AB