Got a boiler plate reply on the "opportunity expired" issue. No use.

However I discovered using iPad and Safari, can go thru Invite link or surveys on eReward site upon log in - no hiccup despite many only yield $0.25 after over 5 min into eligibility screening, rather annoying.

Since all devices use the same home network therefore same IP address, I have to conclude this is not related to IP address. It only happens on Desktop regardless Firefox or Chrome, though with sporadically success between the frequent "opportunity expired" messages. I replied to their boiler plate message pointing out that fact. Meanwhile will use iPad instead.