No, one eSIM cannot be installed on multiple devices simultaneously. Once you've activated an eSIM on a specific device, it becomes tied to that device and can't be transferred to another device. This restriction ensures that the eSIM remains securely associated with the intended user and device.
To use an eSIM that is currently installed in an old device on a new device, please delete/ uninstall the eSIM in the old device first, before installing it on the new device.