Why only have 3 Availability Zones in Tokyo region (ap-northeast-1) ?

Question

Why only have 3 Availability Zones in Tokyo region (ap-northeast-1) ?
![tokyo region availabiluty zones](/media/postImages/original/IMwSN4WbAlSm-bZokPZ7FysA)

But aws say have 4 zone in tokyo region in docs.
https://aws.amazon.com/about-aws/global-infrastructure/?nc1=h_ls
![Enter image description here](/media/postImages/original/IM67jiDoHiS4iXA-r-ioGd2g)

Answer

I think this is because the old AWS account shows "ap-northeast-1b", but the new account only shows "ap-northeast-1a", "ap-northeast-1c" and "ap-northeast-1d".

Why only have 3 Availability Zones in Tokyo region (ap-northeast-1) ?

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