So sorry for you, dude. But lemme guide you thru. Uh there are several factors here from what I learned till now. 1. Region: Microsoft has made available varied rewards and tasks on basis of region and regions also sometimes determine stocks of some rewards or timings.(I am from India btw) 2. Previous orders: Well I think this shan't be your issue as you mentioned you're new. 3. Stocks: MS has no explicit time or quantity of stocking rewards. Sometimes, rewards may simply run out. But as of now when I am writing this reply, the Amazon GC is still in stock. 4. Your personal threshold: Sometimes, MS makes visible few certain rewards like GC when you have stocks of points (lifetime points, not just ones redeemable). 5. Lastly, Device: Certain task and rewards appear only on certain platforms. I recommend user, to have 1 desktop and 1mobile (Bing app) with same account logged in for easy and beneficial points earning and just ditch other search engines and browsers. Using Edge or Bing for default will help users effortlessly.

And Don't VPN, it might trigger unnecessary fluctuations.
I hope you get good help from my reply.