SQL*Plus issues with connection to DB from Command Prompt

I am on SQL*Plus: Release 21.0.0.0.0, on a Windows machine.

In the command prompt, when I do

C:\users\TOMMY> sqlplus /nolog

I see this

SQL>

Here I connect to the Database using a connection string(EZ Connect format)

With Credentials,

username -> dddd

pwd -> wefm@vrev

host -> local

port -> 15210

ServiceName -> abcd.xysp.gthe.com

SQL> connect dddd/"wefm@vrev"@local:15210/abcd.xysp.gthe.com

And I see Output(after a few seconds),

Connected.

My issue begins when I decide to connect from Windows directly with sqlplus. Mentioned below

C:\users\TOMMY> sqlplus -S dddd/"wefm@vrev"@local:15210/abcd.xysp.gthe.com

Results in an error, I am baffled. What am I missing

ERROR: ORA-12154: TNS:could not resolve the connect identifier specified

I have also tried putting the connection string in single quotes ('). When I do that I get this whole thing printed out, which I assume is indicative of me passing the wrong args.

SQL*Plus: Release 21.0.0.0.0 - Production Version 21.3.0.0.0

Copyright (c) 1982, 2021, Oracle. All rights reserved.

Use SQLPlus to execute SQL, PL/SQL and SQLPlus statements.

Usage 1: sqlplus -H | -V

-H             Displays the SQL*Plus version and the
               usage help.
-V             Displays the SQL*Plus version.

Usage 2: sqlplus [ [] [{logon | /nolog}] [] ]

is: [-C ] [-F] [-L] [-M ""] [-NOLOGINTIME] [-R ] [-S]

-C <version>   Sets the compatibility of affected commands to the
               version specified by <version>.  The version has
               the form "x.y[.z]".  For example, -C 10.2.0
-F             This option improves performance in general. It changes
               the default values settings.
               See SQL*Plus User's Guide for the detailed settings.
-L             Attempts to log on just once, instead of
               prompting on error.
-M "<options>" Sets automatic HTML or CSV markup of output.  The options
               have the form:
               {HTML html_options|CSV csv_options}
               See SQL*Plus User's Guide for detailed HTML and CSV options.
-NOLOGINTIME   Don't display Last Successful Login Time.
-R <level>     Sets restricted mode to disable SQL*Plus commands
               that interact with the file system.  The level can
               be 1, 2 or 3.  The most restrictive is -R 3 which
               disables all user commands interacting with the
               file system.
-S             Sets silent mode which suppresses the display of
               the SQL*Plus banner, prompts, and echoing of
               commands.

is: {[/][@<connect_identifier>] | / } [AS {SYSDBA | SYSOPER | SYSASM | SYSBACKUP | SYSDG | SYSKM | SYSRAC}] [EDITION=value]

Specifies the database account username, password and connect
identifier for the database connection.  Without a connect
identifier, SQL*Plus connects to the default database.

The AS SYSDBA, AS SYSOPER, AS SYSASM, AS SYSBACKUP, AS SYSDG,
AS SYSKM and AS SYSRAC options are database administration privileges.

<connect_identifier> can be in the form of Net Service Name
or Easy Connect.

  @[<net_service_name> | [[//]Host[:Port]/<service_name>] |
    [[[protocol:]//]host1{,host12}[:port1]{,host2:port2}[/service_name]
     [:server][/instance name][?[parameter name=value]
     {&parameter name=value}]]]

    <net_service_name> is a simple name for a service that resolves
    to a connect descriptor.

    Example: Connect to database using Net Service Name and the
             database net service name is ORCL.

       sqlplus username/mypassword@ORCL

    Host specifies the host name or IP address of the database
    server computer.

    Port specifies the listening port on the database server.

    <service name> specifies the service name of the database you
    want to access.

    Example: Connect to database using Easy Connect and the
             Service name is ORCL.

       sqlplus username/mypassword@Host/ORCL

The /NOLOG option starts SQL*Plus without connecting to a
database.

The EDITION specifies the value for Session Edition.

is: @|[.] [ ...]

Runs the specified SQL*Plus script from a web server (URL) or the
local file system (filename.ext) with specified parameters that
will be assigned to substitution variables in the script.

When SQLPlus starts, and after CONNECT commands, the site profile (e.g. $ORACLE_HOME/sqlplus/admin/glogin.sql) and the user profile (e.g. login.sql in the working directory) are run. The files may contain SQLPlus commands.

Refer to the SQL*Plus User's Guide and Reference for more information.

I would like a solution that only involves using a connection string. I don't want to be using tns_ora file Also without any manual intervention. I don't want to separately enter the password after I put in 'username@connect-identifier'.

Please ignore security related issues of passing in the password visibly in the cmd prompt. That is fine with me.