@amyegan Are you able to confirm this? Or is Vercel only adding domains on a case by case basis as it seems they are not officially supporting the PSL as I have tried other domains on the PSL and they are not working like is-a.dev now is.
Thanks for checking on this. I believe it’s case-by-case for the moment. But I asked the team about it and I’ll let you know when I learn more.
@amyegan Are you able to add is-a-good.dev as an exception too, it is also listed on the PSL and experiencing the same verification issues.
The team confirmed that updates are manual for now.
I’ll open a PR to get is-a-good.dev added for you
The PR was merged 
You should be able to use is-a-good.dev domains now. Please let me know if you run into any trouble with it