TIPS on setting up a custom domain on your WA account:
1- Set DNS records first [make sure to include CAA record]
if you can toggle TTL to a low number, do so.
2- Add a custom domain to your WA account [Make sure the SSL install checkbox is checked]
you will need to add both www and non-www domain names
4- Click the [check] box next to the newly added custom name
5- Correct any errors [Note the tricky one being combining multiple spf record entries into 1]
6- If you are not able to see the SSL install, note WA uses public DNS toolbox to confirm your settings like: https://toolbox.googleapps.com/apps/dig/#ANY/
7- Once completed and all your [check] boxes are green, set the primary or default domain