WordPress installation in a folder

Hello,
inside my wordpress directory in a domain named eg. https://www.mydomain.gr, i created a folder with name “eshop” and i installed inside this folder a new wordpress installation.

When i go to https://www.mydomain.gr/eshop/wp-admin and i insert the username and password it redirects me to the main https://www.domain.gr and is says that page is not found.

How can i seperate this installation in order to work independent??

Any help would be appreciated!
Thank you
Kostas