Error is pretty self explanatory, either you specified a non existent username in the instance ORCL, or the username does exist and you gave an invalid password.
Is this a new installation?
There is no user "admin" created by default, try username "SYS" with role SYSDBA to connect as administrator.
I just start a new ATP on Oracle Cloud Free Tier.
It does ask you to set the password for ADMIN.
Most likely, that is the name/password for the APEX Internal of your Cloud instance. (its still provisioning)
The OP needs to provide more information.
PS if it is an ATP on Oracle Cloud Free Tier - The config looks like this:
(The ZIP file is the wallet+ stuff you downloaded)