Issue with HV boost converter using TL5001
I've managed to make it work. There seemed to be 2 issues with the circuit.
First the R11 value of RT that dictates the switching frequency was too large, based on the datasheet it says that the acceptable resistor values are between 15kΩ and 250kΩ for 500kHz and 20kHz respectively. I have no clue of why the 6.8MΩ was chosen. As a replacement I've put 500kΩ resistor.
Second issue was indeed the resistance value of the feedback loop being too high, which due to low response triggered SCP (as suggested in the question comments). Lowering the resistance (by shorting one of the 2.74MΩ) and with the above modification made TL5001 active and output the expected voltage (based on the new feedback configuration ofcourse).