i am shocked its working now. Even after i accidentally deleted all dummy users and Admin from DB and then, after that i manually added them all - still It works.

I am able to reset my pw as admin. I am able to reset pw of registered users if they have a valid email address.

but For dummy users its not possible to reset pw I guess right coz the email is dummy? thank you anyways, for insightful question which led me to test again. I appreciate you spent your time reading the question and reply.