In case of no organisations being available where the user's membership is admin, owner or editor, communicate this to the user as an invalid token error;
In case of one organisation being available with sufficient permissions, automatically select this organisation and communicate this to the user; and
In case of multiple organisations being available, communicate the requirement to select one to the user together with a selection element.
When an organisation was previously selected, and an attempt is made to change organisations, inform the user that this action would clear their existing data.
Once a token has been set:
When an organisation was previously selected, and an attempt is made to change organisations, inform the user that this action would clear their existing data.