Hello,

Here is video https://mega.nz/file/gnhETKKJ#l1CR_VbRAjQ3h9NEqXxog-K0KZVzcUpaQcbD9KonSg4 

After create subscription, copy the product i'd and go to your Admin panel and Put your Price and Product I'd inside your IAP Subscription Page
And make sure you have added your Product I'd Correctly and the Same Product I'd that you have created.

Plan I'd and Base Plan I'd will be Same, Mean create 1 Plan > Put I'd after that Create Base Plan using same I'd Inside that and Select  (auto-renewing) then Put Your Price.

Thanks..