@SallyG , I was thinking more like 5-10 minutes, honestly. If you've just been added as an administrator to an organization, it seems to take 5ish minutes most days. 10 on a very sloooow one.
I do find occasionally that a refresh of the browser clears these things up. We had a stubborn org on one of the N servers where a logout and login was needed to reflect the change weirdly!
just do a new Meraki portal registration https://account.meraki.com/login/new_account with tha same email address that you are using for your current dashboard login and in the "Company" field put your new Organization name.