R script converting Easting/Northing to lat/long for mapping visuals

I have data in the form of easting/northing and i'm trying to convert these to latitude/longitude using R script.  So far i have tried running a script against the datasource as follows.

Here is the initial data.

Script Run

Output

I have also tried using the following script however the same issue occurs where it just returns the original data without a conversion.

The output produces no errors however it is not converting it either.  My understanding is that after the script is run the table which is expanded should have a x and y column with the converted co-ordinates. Is there something that i am missing out? Or can R not be used in this way to convert the coordinates?

Appreciate any help 🙂

TIA