This is the recommended solution from dreamhost. It’s a bit late tonight for myself to get stuck into the solution but I am posting this for anyone experiencing this issue with dreamhost.
Hello Christopher,
Thank you for reaching out to DreamHost support. I will be more than
happy to help you with your request.
I understand from your message that you need assistance as you are
currently getting several 418 erros. Usually, these errors are Mod Sec
errors blocking the process currently performed.
However, I have checked the error logs and I have added some exception
rules and ran some configs/updates on it. You should now be able to
proceed with the process mentioned and it should not generate these
errors. If by any chance it does, feel free to disable Mod Sec and try
again. You can follow the steps mentioned in this article for information
on how to disable it:
https://help.dreamhost.com/hc/en-us/articles/215947927-How-do-I-enable-Extra-Web-Security-for-my-website-
I hope this information results useful, feel free to reply anytime should
you have any further questions or if you need additional assistance, I’d
be happy to help!
Please stay safe and healthy!
John H