Could you tell me how to get a copy of resident certificate with my number?

You can obtain a copy of resident certificate with your My Number at the ward office Family Registry Division or the Administrative Service Corner in Yokohama.
The copy of resident certificate usually does not include your My Number, so please indicate on your invoice that your My Number is required. In addition to the procedures at the counter, procedures by mail, and those who have a My Number card can apply online or at convenience stores.
For details on how to proceed, please refer to the relevant website.

Issuance of certificates by family register, resident certificate, Seal Registration, etc.