When trying to log in, "Object.hasOwn is not a function" is displayed. What should I do?

This error is displayed when you access Teachme Biz using an outdated OS Version, an iPhone or iPad, or an outdated Browser.

Please update to the Version listed in the system requirements, then try logging in again.

List of System Requirements

Depending on your device, it may not be possible to update to the Version listed in the system requirements.
In that case, please prepare a separate device that meets the system requirements.

Tell me about environments where Teachme Biz cannot be used