By default, kintone pages cannot be displayed on external websites or systems.
If you want to display kintone pages on websites or systems outside your kintone environment (https://subdomain name.cybozu.cn/), you need to enable Embedding into External Sites.

Enabling Embedding into External Sites can pose security risks. For example, protection from clickjacking will no longer be offered, and users may be tricked into performing undesired actions.

It is recommended that you do not enable Embedding into External Sites unless necessary. If you do enable the setting, make sure to do so only after considering all of the potential risks.

Clickjacking is an attack where transparent Web UI elements or other tricks are used to direct a user to click on a page different from the one the user is viewing. This attack can cause information leaks, for example, by causing users to unintendedly perform an action to disclose sensitive information.

For the steps to enable Embedding into External Sites, refer to the following page.
Allowing cybozu.cn Screens to Be Embedded in Other Web Sites