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Hi pjcs31on, welcome to the community!
Try downloading your internet settings again to see if that works otherwise you may want to contact Sony Xperia Customer Care in your region about this.
To download internet settings just go into Settings > More > Internet settings > accept.
Hi Theofilos, welcome to the community!
Have you tried downloading your internet settings? If so and you have mobile data & hotspot turned on and you still can't connect then try contacting your local Sony Xperia Customer Care team as they may have a fix for you.
I still do advise contacting your local support team as you may need to create a new APN or they may know a fix for you.