In this case the tab ‘Microsoft 365’ was missing from the customer. The Microsoft 365 tile was still available but gave an error that it doesn’t exist.

Error

ERROR 404
Sorry, we can’t find the page you’re looking for it has been moved, deleted or never existed.
You can go back to where you came from, get to the home page or contact our support team.

Solution

The initial subscription that was ordered was cancelled but not destroyed. As soon you destroy the subscription it should work. You might need to refresh the page once.