ドキュメント読んだ感じ、NTT経由で申し込まないとAP-Northeast-1は有効化されないのね…
"currently only available to NTT Communication (NTT Com) customers" 
How do I access the Wasabi Tokyo (ap-northeast-1) storage region? http://wasabi-support.zendesk.com/hc/en-us/articles/360039372392-How-do-I-access-the-Wasabi-Tokyo-ap-northeast-1-storage-region-
wasabi-support.zendesk.comHow do I access the Wasabi Tokyo (ap-northeast-1) storage region?Access to Wasabi's Tokyo storage region (ap-northeast-1) is currently only available to NTT Communication (NTT Com) customers that obtain the service from NTT Com as part of the NTT Com Enterprise ...
"Access to Wasabi's Tokyo storage region for non-NTT Com customers is planned for later in 2020." とあるので来年ぐらいには東京リージョンが一般公開だね（ニッコリ