Redirection to old organization authorization blocks login to Azure Portal
I recently signed up for a free Azure subscription for a course, using my personal e-mail. This seemed to work fine and I received a confirmation e-mail after completing all the verification steps. Many many years ago, however, my personal e-mail was used to create a guest account for an organization that I no longer have any contact with. When attempting to login to Azure Portal now, I keep getting redirected to this old organization and am blocked with a sortof non-descript 'you do not have permission to access this' failure message (see screenshot below).
Signing in and out, using a different browser, using a different computer, clearing cache and cookies etc.. does not seem to make any difference. I cannot find any way to remove the organization affiliation either. So it seems I have an Azure subscription now that I cannot change or use. Is there anything I can do to resolve this or any resource that might help?