Trying to execute script through tclsh + sftp

For context i am trying to run a script that is hosted on a server made with TCL.

To run this script i log in a Cisco router and use the command:

tclsh tftp://[server_ip]/location/script.tcl

and it works over tftp, but when i try with sftp it does not work, says "No such file or directory", even tho i can copy the file and that works.

the command i use to cope the file is

copy sftp: flash:[server_ip]/location/script.tcl

so the router supports sftp.

and to try to run it i do exactly like tftp:

tclsh sftp://[server_ip]/location/script.tcl

to no avail.

So the copy works but executing the script does not work.

Any idea on how to fix this?

EDIT: I also tried SCP to no avail