Batch File Skipping over FOR LOOP - loops

Question

UPDATE
I removed the tokens=4 and it started outputting data. It is not skipping past the FOR LOOP. I was skipping too far ahead with the tokens. I am still a little confused as to why it works as a single batch and not from this batch but now at least I know what the issue was. Thank you to everyone that was looking into this for me.
I am writing a script to copy over data from one computer to another. The issue is that it is skipping over the FOR LOOP that I am calling from another FOR LOOP. If you are testing the script it requires two PC's and a mapped T: drive to somewhere on the second computer. I can write the script so it looks for an external drive if that is more helpful to someone.
FOR /F "tokens=4 skip=1" %%a in ('REG QUERY "%_regshell%" /v "%_regdesktop%"') DO (
SET _dt=%%a
echo robocopy "!_dt!" "!_NetworkDrive!\!_fndesktop!" !_params!
echo attrib -h -r "!_NetworkDrive!\!_fndesktop!"
)
If I write the FOR LOOP above in a batch by itself and just echo out %%a then it works without a problem. In this, I can see that it is indeed calling :_backup but it skips directly over the FOR Loop and I am not sure why. I have written scripts like this many times but never had any that just completely ignore the FOR Loop. Can anyone take a look and assist? Thank you.
#echo off
:: Set Variables
SET _driveID=T:
SET _params=/Z /E /COPY:DT /R:1 /W:0 /XD LocalService NetworkService temp "temporary internet files" winsxs Content.IE5 cache /XF ntuser.* *.tmp /XJ /FP /NC /NS /NP /NJH
SET _regshell=HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
SET _regdesktop=Desktop
:: Set Current Directory
pushd %SystemDrive%\
:: Start Menu - Create Choices and Options. Send to various places to perform the actions.
:_start
cls
ECHO Please type either option 2 or 3 and then press ENTER on the keyboard?
Echo 2. TRANSFER FILES FROM DESKTOP TO LAPTOP
Echo 3. EXIT THE PROGRAM
echo.
set /p choice=Enter Number:
if '%choice%'=='2' goto _desktopToLaptop
if '%choice%'=='3' goto :EOF
echo "%choice%" is not a valid option. Please try again
echo.
goto _start
:: Detect Drive Letters
:_desktopToLaptop
setlocal EnableDelayedExpansion
FOR /F "usebackq skip=1" %%a IN (`WMIC logicaldisk where DeviceID^="%_driveID%" get caption`) DO (
SET _NetworkDrive=%%a
if exist %%a (
CALL :_backup
goto :EOF
) else (
echo.
echo The laptop does not appear to be attached to the computer.
echo.
pause
goto :EOF
)
)
:_backup
:: Detect the folder locations and begin to backup each location to the laptop.
FOR /F "tokens=4 skip=1" %%a in ('REG QUERY "%_regshell%" /v "%_regdesktop%"') DO (
SET _dt=%%a
echo robocopy "!_dt!" "!_NetworkDrive!\!_fndesktop!" !_params!
echo attrib -h -r "!_NetworkDrive!\!_fndesktop!"
)
echo we are past the for loop
pause
:: Return to directory program was run from
popd

Answer 1

If anyone else runs into this issue or something similar, check your tokens and your skip. Mine worked just fine as a single batch but when I included as a call I had to change the options from tokens=4 skip=1 to tokens=3* skip=2 in order to get the correct output.
The correct tokens in that FOR LOOPS should be:
#echo off
:: Set Variables
SET _driveID=T:
SET _params=/Z /E /COPY:DT /R:1 /W:0 /XD LocalService NetworkService temp "temporary internet files" winsxs Content.IE5 cache /XF ntuser.* *.tmp /XJ /FP /NC /NS /NP /NJH
SET _regshell=HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
SET _regdesktop=Desktop
:: Set Current Directory
pushd %SystemDrive%\
:: Start Menu - Create Choices and Options. Send to various places to perform the actions.
:_start
cls
ECHO Please type either option 2 or 3 and then press ENTER on the keyboard?
Echo 2. TRANSFER FILES FROM DESKTOP TO LAPTOP
Echo 3. EXIT THE PROGRAM
echo.
set /p choice=Enter Number:
if '%choice%'=='2' goto _desktopToLaptop
if '%choice%'=='3' goto :EOF
echo "%choice%" is not a valid option. Please try again
echo.
goto _start
:: Detect Drive Letters
:_desktopToLaptop
setlocal EnableDelayedExpansion
FOR /F "usebackq skip=1" %%a IN (`WMIC logicaldisk where DeviceID^="%_driveID%" get caption`) DO (
SET _NetworkDrive=%%a
if exist %%a (
CALL :_backup
goto :EOF
) else (
echo.
echo The laptop does not appear to be attached to the computer.
echo.
pause
goto :EOF
)
)
:_backup
:: Detect the folder locations and begin to backup each location to the laptop.
FOR /F "tokens=3* skip=2" %%a in ('REG QUERY "%_regshell%" /v "%_regdesktop%"') DO (
SET _dt=%%a
echo robocopy "!_dt!" "!_NetworkDrive!\!_fndesktop!" !_params!
echo attrib -h -r "!_NetworkDrive!\!_fndesktop!"
)
echo we are past the for loop
pause
:: Return to directory program was run from
popd

Answer 2

Given that the main issue in your script appears to be the setting of a variable to the data within the defined registry key and value, you could use:
Set "_regshell=HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders"
Set "_regdesktop=Desktop"
Set "_dt="
For /F "EOL=H Tokens=2*" %%A In ('Reg Query "%_regshell%" /V "%_regdesktop%"'
) Do Set "_dt=%%~B"
If Not Defined _dt GoTo :EOF
Echo "%_dt%"