@sajal
Please check if you are login using the correct panel.

For admin/agent panel default path will be on URl like below.

your_host/public/en/member/login

else

If accidentally forget your admin password and not able to login just after finishing installation can create a new admin password using below command.

php bin/console uvdesk_wizard:defaults:create-user ROLE_ADMIN

Just fill all the details for the admin and login using new details.