'When logging in to Oracle Enterprise Manager, it is asking me for the credentials again. Why?

I'm trying to log in to: https://localhost:5500/em/login

First, I entered my credentials at the bottom right area. Then, I clicked the button. After that, a pop-up appeared at the top of the page.

Why is it asking me this? What should I input?

I tried putting the same values, but I still couldn't get through.

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Solution 1:[1]

Got the solution from: https://docs.oracle.com/en/database/oracle/oracle-database/12.2/admqs/getting-started-with-database-administration.html#GUID-06C767B0-B435-4C6B-9123-C39C030DF457

3.4.3 Starting EM Express for a PDB To start EM Express for a PDB, ensure that the PDB is open in read/write mode and then try one of the following methods described in this topic (in the order shown):

Connect to the CDB$ROOT container for the CDB that includes the PDB, and issue the following SQL statement to configure the global port for the CDB:

exec dbms_xdb_config.setglobalportenabled(TRUE);

Solution 2:[2]

One Note, if you are trying to log into the Container rather than the Pluggable database, put the Container name as "CDB$ROOT". I tried my container name and it didn't work, but putting that in allowed me to connect to the Container itself. Good luck!

Sources

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Source: Stack Overflow

Solution Source
Solution 1 programmer-man
Solution 2 user9947413