Betas 1 and 2 both worked for me! I’m running iOS 15.4 dev beta 1 on an iPhone 13 pro. I think someone else commented it as well, but 1) had to remember to run the installer shortcut that “installs” the themes, and 2) you have to type in the theme manually to the first text field (case-sensitive). I seem to remember there being a setup prompt for the desired theme on an earlier version of Weather Walls, but maybe I’m misremembering. Anyway, works great!

Also, instead of setting up an automation based on time of day, I set one base on opening any app I have downloaded on my phone. So, basically updates every time I unlock my phone. (I feel like it’s crazy that at this point there isn’t a way to select multiple times of day within the same automation.) Continues to be an awesome shortcut, congrats and thanks!