Strange error

Im attempting run run the following:
@echo off
"C:\Program Files (x86)\WinScp\WinSCP.com" ^
/log="C:\Users\MHeat\WinSCP.log" /ini=nul ^
/command ^
"open sftp://mark:*******@1xxx.xxx.x.xxx/ -hostkey=""key""" ^
"synchronize both C:\Users\MHeat\WinToLinFileShr /home/mark/WinToLinFileShr" ^
"exit"

Im getting an error of the following:

[Everything runs fine with authenticating up to this and then it fails". Which "^" is causing the issue?]

< 2025-05-08 16:32:09.548 Script: Active session: [1] mark@xxx.xxx.x.xxx
> 2025-05-08 16:32:09.549 Script: ^
< 2025-05-08 16:32:09.551 Script: Unknown command '^'.
. 2025-05-08 16:32:09.552 Script: Failed