A brand new SSD is required to be formatted before use. It is suggested to use an external USB Disk connector to connect the new SSD to your PC and format it before use. You can either create different partitions or choose to keep the SSD as a single disk.
Post format it’s ready to use as an external disk or internal disk to install OS and all.
However, if you find it hard to connect the SSD using external port then it might be some hardware issues and you may need a new replacement.