What should I do if my MacBook Pro won't activate after a reset?

I am using macbook pro m3. yesterday i created a new user with administration privillage but unfortunatelay i edited my last admin user with same username. after restart my mac when i put my password and enter it spinning for a long time but not log in. for that i factory reset (erase mac) and tried to setup new os. my last mac os was updated. whenever i tried to activate mac by wifi network it says "Failed to activate device". I attempt it for long time with wifi, mobile data but not working. what can i do now ?

[Re-Titled by Moderator]