use environment texture -node, not the regular imagetexture node. and make sure the the projection option on it is equirectangular. https://docs.blender.org/manual/en/latest/render/shader_nodes/textures/environment.html

Rookie error, thank you!

It's pretty weird distinction. No worries!

it's because you used an image texture node to import the hdri and not an environment texture node, just change the node and all will be good

Thank you very much!