Thank you for reaching us!
May I know what the website name and URL (Intel Azure website) is, where you bought it and what are the steps you have followed to sign in could you please share the error screen shots or documents you have followed.
Based on the error message AADSTS90072 you received is because the email which you are using is not have access to the application. external account that you signs in with doesn't exist on the tenant that they signed into.
To fix this issue the account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.
check if the user account exists in Azure AD Tenant. If the user doesn’t exist in the tenant, add them to your Azure AD. If the user is present, check if the invitation is accepted; If not, ask the user to accept the invitation.
Hope this helps. Do let us know if you any further queries by responding in the comments section.
Thanks,
Akhilesh V.
If this answers your query, do click Accept Answer
and Yes
for was this answer helpful. And, if you have any further query do let us know.