authorization
i only have 3 computers authorized and It won't let authorize another computer. Help?
If you have tried to de-authorize all, and then re-authorize the needed ones, then you have done all you can by yourself.
If the issue persists, then it may be time to have Apple Support staff go though the administration of this at Apple. Contact Apple for support and service (phone numbers) or start your support request online (chat/email/callback).