This means the IAM user you created does not have the correct permissions to access the buckets you listed on the login page. This could be because of a typo somewhere in the policies, or maybe you entered the names of the buckets incorrectly on the form?
Thanks for the reply - I use static sites on S3 a lot, so pretty confident of the setup. I've also replaced the installation ones with my usual policies (slightly different) and getting the same error. Anything else I can try?
