Hey, I've been trying to install APEX 19.1 and 21.1 and after installing each of them I get this window in my browser (both MS Edge and Google Chrome) that asks for login credentials of some unknown kind. Can anyone tell me what this is all about?

I'm attaching commands I used to install and configure apex:
alter session set container=orclpdb;
@apexins.sql sysaux sysaux temp /i/
@apxchpwd.sql
@apxldimg.sql <path_to_apex_folder>
@apex_epg_config.sql <path_to_apex_folder>
exec dbms_xdb.sethttpport(9090);
alter user anonymous account unlock;
alter user xdb account unlock;