Hi,
Our customer wants to use Trello in Sharepoint; in the SharePoint pages, you can add Trello via MS page builder.
We get to sign in, and then, I can select an account, board - but when I click next; we get the following error.

I have raised this with Microsoft, and after a week of waiting to get back - they say it's not their issue.
Any idea on how to get this fixed would be great.
Thank you.