4+ years on my original V1 cams and Base. Finally two cams died. With V1s hard to find, I found assurance V2s would work with V1 Base. Setup was OK. (Sync buttons on cam and Base) Live Stream OK. But trying to view Event Recordings sent me to a subscription needed page.
After a LONG chat, I now know: SD cards in the V2 cams not required to view Events directly. You have to dig into Account/Services/menu to find Cam Plus Lite, and Assign it to the new cams. Voila! Event viewing without subscription!