I just spent a day trying to debug my OpnSense router IPv6 config, after my current ISP started a campaign to invite all of their users to enable it.
In a support call just now, I was advised that the commissioning and deployment at their end has not been completed, so it would not have worked anyway.
Not sure I should shame then openly, but I would have thought that completing the commissioning before encouraging customers is much better than inviting thousands of people to waste their time.