A:Answer O2nz, no one has answered you question, "What's the time period in which you must activate service (i.e. within how many days of purchase)?" for 11 days now, and I had the same question. I phoned Best Buy Front End Leader, Casey Cass, at store #112. He said the Tidal subscription is considered a software sale by Best Buy, and the activation code has no expiration. Although Casey assured me over the phone the activation code could be used at any time, he advised me that Best Buy employees are not permitted by Best Buy to put this information in writing. That explains why this question was not answered by any Best Buy employee. Casey advised if there is any problem using the activation code, Best Buy will not assist. Instead Best Buy refers you to Tidal. Note,
https://support.tidal.com/hc/en-us/sections/360002539918-Best-Buy
states that subscription problems will be handled by calling Best Buy. So good luck!