Hi Matt, welcome to the PurpleAir community!
Currently, Weather Underground only picks up new sensors 1 or 2 times per week, so it could take up to a week for your sensor to appear on the Wundermap once it’s been registered on the PurpleAir map. Additionally, if you’ve registered the sensor as “private,” it won’t appear on Weather Underground.
If you’ll send us an email at contact@purpleair.com or a private message to the moderators with the device ID of your sensor, we can look into it for you.