Okay. New development.
My board has not been active/switched on due to making changes I'm making. I visited as guest, and noticed, like you say - it just shows the board, but offline.
I switched my board online, and can confirm that the message on aun was then a white page with -
{
"message": "GET is not valid",
"status": 400
}
Going to my addons section, with the board still active - the blue message stating that 'The callbacks for add-on updates seem to be blocked' - Do I still have an issue, or does this take a while to change?
Strange that the board being closed stopped that. I don't think thats documented here. Probably a good edge case