Sorry for the late reply, which IP address are you trying to ssh to? Unless you’ve set a static one your router’s dhcp server will pick one for it, so you need to ssh using that one.
I use an ip scanner myself just for the convenience, but you can also check your router’s page (usually 192.168.1.1) for the assigned addresses or run an arp scan in a terminal to get the list of all addresses.
Then you just have to figure out which one of them is the pi.