Below is the certification photo for the NiZ Electro-Capacitive Keyboard.
Please refer to the document for confirmation.

Please note that the certifying body for this certificate is PHOENIX TESTLAB GmbH, a German certification organization. It is not a certification body under Japan's domestic "Technical Conformity Certification for Designated Equipment," but rather a Registered Foreign Conformity Assessment Body (RCAB) recognized through mutual recognition.
This certifying body, "PHOENIX TESTLAB GmbH," is listed on the Ministry of Internal Affairs and Communications (MIC) website under the "System Overview (List of Registered Certification Bodies)."
Link: https://www.tele.soumu.go.jp/j/sys/equ/tech/
The issuance date for the NiZ Electro-Capacitive Keyboard's technical conformity certificate is stated at the bottom of the document.
Our product obtained certification on March 24, 2021.
Although the certification was properly granted through a registered RCAB approved by MIC in March 2021, the technical conformity information for the NiZ Electro-Capacitive Keyboard is not yet listed publicly in the Japanese database.
As such, it will not appear in the official search results for now.
We sincerely apologize for any confusion or inconvenience this may have caused.