Thank you for your help @Pilgrimsmaster
Unfortunately the command t5 detect will return
[usb] pm3 → lf t5 detect
[!] 
Could not detect modulation automatically. Try setting it manually with ‘lf t55xx config’
on both of the tags.
I have previously tried the command lf t55xx config but don’t really know what I am doing with that.
Would you be able to walk me through the process?
Thank you again