Can't enable Mobile data

Hi Tatiana. Im searching to try and find some information on getting my new Emlid RS2 (data sim fitted) to connect to the app for NTRIP data. For some reason I am unable to activate the Mobile Data On/Off tab which is greyed out. I have been able to tick the field underneath - Share mobile data from reach in hotspot mode. Im clearly doing something wrong. Many thanks if you can assist me please?