How to Link a Custom Domain to My Okta Tenant

 I have a developer tenant in Okta and would like to add a custom domain.  This should be possible, all I need is a few things:

1. A Developer Okta tenant
2. My own custom domain
3. A certificate, which I will get by using Lets Encrypt

First, I read up on the Okta documentation:

https://developer.okta.com/docs/guides/custom-url-domain/overview/

Next, I had to get a certificate.  I'm running on Windows 10 so I followed these steps to obtain a certificate by running the Windows Subsystem for Linux.

https://medium.com/beyond-the-helpdesk/lets-encrypt-for-windows-10-e07556c811b4

I ran into a few issues with DNS on my Linux instance so I followed this article.  I also had to make sure I disabled my network security app temporarily so that it wouldn't mess up my TLS handshake.

https://superuser.com/questions/1533291/how-do-i-change-the-dns-settings-for-wsl2

NOTE: for the TXT records, I had to add just the subdomain names like this: