@cucurbitamaxima did you link your Android to the account? When you activate on your Android, it just uses your Google Play account. It doesn’t save details to Brave Account. So if you’re then going to desktop and trying to sign in to the Brave Account, then you would have no active subscriptions…as you didn’t sign up for it that way.
To be clear, are you following instructions as provided at https://support.brave.com/hc/en-us/articles/13405790544653-How-do-I-add-a-new-device-to-an-existing-VPN-subscription ?