Windows – Pass variable to filename in Windows FOR / DO Batch File

I have the following code where I systematically go through and compress each file individually. I don't care what the file name is, but I want it hidden more or less so will just call each file "file 1", "file 2", "file 3" etc.

But how do I pass the variable fn=file!count! to the 7z.exe command line? I added the echo commands just to make sure the variable was working, and it does. But how do I get fn to resolve as actual "file1" "file2", etc in the 7z command line? I've tried %, !, %!, !%, %%… lol. It just gives a blank file name or !fn! or %fn% not the actual variable value.

Code is here and thanks in advance for any assistance:

setlocal enableextensions enabledelayedexpansion
cd /d E:\Temp\ziptest\Documents
set /A count=0
for /r %%a in (*) do (
cd "%%~pa" 
set /A count += 1
echo !count!
set fn=file!count!
echo !fn!
pause
REM 7z.exe a -mx9 -mmt12 -sdel -pt3st! -mhe=on "!fn!.7z" "%%~nxa"
)
endlocal

Example of output where you can see it's incrementing properly and resolving file## properly as well:

E:\Temp\ziptest>setlocal enableextensions enabledelayedexpansion

E:\Temp\ziptest>cd /d E:\Temp\ziptest\Documents

E:\Temp\ziptest\Documents>set /A count=0

E:\Temp\ziptest\Documents>for /R %a in (*) do (
cd "%~pa"
 set /A count += 1
 echo !count!
 set fn=file!count!
 echo !fn!
 pause
 REM 7z.exe a -mx9 -mmt12 -sdel -pt3st! -mhe=on "!fn!.7z" "%~nxa"
)

E:\Temp\ziptest\Documents>(
cd "\Temp\ziptest\Documents\"
 set /A count += 1
 echo !count!
 set fn=file!count!
 echo !fn!
 pause
 REM 7z.exe a -mx9 -mmt12 -sdel -pt3st! -mhe=on "!fn!.7z" "Book1.xlsx"
)
1
file1
Press any key to continue . . .

E:\Temp\ziptest\Documents>(
cd "\Temp\ziptest\Documents\"
 set /A count += 1
 echo !count!
 set fn=file!count!
 echo !fn!
 pause
 REM 7z.exe a -mx9 -mmt12 -sdel -pt3st! -mhe=on "!fn!.7z" "COVID-19 Oakland County.xlsx"
)
2
file2
Press any key to continue . . .