Hotspot unavailable- grayed out of settings

Hello, so im using iphone 13. I just bought a new esim (i change carrier) from the previous one my hotspot was working fine, but with the new one, suddenly i cant turn on hotspot, it cant be toggled, its grayed out. Can anyone help? I tried to change to their own apn but still didnt work. I need hotspot to connect my ipad but its not available. Someone help me fix it