Hello Nandha,
Please share your website url and please give us temporary access to your website dashboard so that we can check the issue on your website.
You can use this plugin for temporary login: https://wordpress.org/plugins/temporary-login-without-password/
You can follow this tutorial to setup this plugin: https://vinethemes.com/how-to-create-temporary-login-for-wordpress-without-password/
Don’t forget about “Set as private reply” at the bottom of the message box
Thanks
