Indian phone not picking up 5G in the UK???

Hi,

I bought a OP15 via a family friend who was visiting India as it was significantly cheaper than here in the UK. I made sure to double check the bands voxi (Vodafone) uses in the UK for 5g before making the purchase. From what I could find it is bands 1,3,5,8 and 78, all of which were listed on the Indian website as supported bands on the OP15. However, it seems my phone isn't picking up any 5g at all??

can anyone help me understand what's going wrong?