NextJS SDK needs documentation on custom domain

Hey @Jeremy,
Sorry that you have been experiencing issues with implementing custom domains for auth with your NextJS app.
I have passed on your feedback on documentation to my team mate who handles our docs.

I assume you have already setup your custom domain in the Kinde Admin.

From looking at the message in the past support thread here, I believe you are missing KINDE_COOKIE_DOMAIN in your .env file.

So I would suggest having a read of this section of the NextJS docs.

Please let me know if you are still experiencing issues.

Thank you, I think I finally got it working as well as I can. I did the cookie thing, but importantly only had to set that on my vercel dev env (not preview envs, prod, or local). Also I was getting mixed up with VERCEL_URL and VERCEL_BRANCH_URL. Following the custom domain and preview docs, that implements VERCEL_URL, which is not what the Vercel Github bot uses. I added a comment here: https://github.com/kinde-oss/kinde-auth-nextjs/issues/86#issuecomment-2064915911

I think I'm good now I'm just trying to elaborate in case you want to add to the docs the difference between VERCEL_URL and VERCEL_BRANCH_URL. And that you can not get both to work, because the env vars are set at build time so you can't dynamically figure out which host the user is using.