No, you cannot use one Phoner account and install the eSIM on multiple devices.
The reason is each Phoner account has a unique eSIM. And each eSIM is strictly tied to a single device.
Therefore, you will not be able to use the same eSIM on multiple devices.
Example: if you had bought an eSIM on your iPhone, you will not be able to use it on your iPad or other devices.
However, if you are on the same device and seeing error message "eSIM was previously installed on this device" this is a different issue, please see the troubleshooting guide here.