Having issue with enabling multisite

Hi Team,

I need to work on multiple websites on my localhost/wordpress/wp-admin dashboard hence I know I need to setup multisite. I have followed the instructions stated here - https://premium.wpmudev.org/manuals/wpmu-manual-2/creating-a-network-to-enable-wordpress-multisite/

The strange part is I am unable to login to localhost/wordpress/wp-admin dashboard once that is done. Any idea why that might be so?

Thanks!
Ken