Migration assistant from one computer to another

Hello, I just did a clean install of Monterey on a 2015 Imac. While setting up I chose to Migrate info from another computer. The new computer recognized the old computer, calculated the transfer size, but won't let me click continue. It also won't let me click Back. It seems my only option is to turn it off by pressing the power button. The operating system on the older computer is High Sierra.