What is the correct format of a string variable to be passed as argument to call a ssh shell script?

I am trying to pass a string variable as an argument to call a ssh_client shell command to find the latest folder on a remote server.

The value["folder"] comes from a json file in the format /home/server/device-2-21, without quotes.

I tried to pass the string argument in different formats without success. The script for searching the latest folder works only with the expression folder = "/home/server/device-2-21".

Pass the string variable folder = /home/server/device-2-21:

device = value["device"]            # from JSONfolder = value["folder"]            # from JSON# folder = Path(folder)             # 1.test FAIL# folder = f'"{value["folder"]}"'   # 2.test FAIL# folder = fr"{folder}"             # 3.test FAIL# folder = f"""{folder}"""          # 4.test FAIL# folder = '"'+folder+'"'           # 5.test FAIL# folder = f"{folder}"              # 6.test FAIL# folder = str(folder)              # 7.test FAIL# folder = rf"{folder}"             # 8.test FAIL# folder = '''+{folder}'''          # 9.test FAIL# folder = repr(folder)             # 10.test FAIL# folder = "%s" % folder            # 11.test FAIL# folder = "{0}".format(folder)     # 12.test FAIL# folder = "%(folder)s" % locals()  # 13.test FAIL# folder = '/home/server/device'    # 14.test OK# folder = "\home\server\device"    # 15.test FAILfolder = "/home/server/device"      # 16.test OKprint(f"folder var type: ", type(folder))print(f"device folder: {folder}")# pass the string variable to the search methodget_latest_device_folder(device, folder)# connect and get the latest folder from the remote serverdef get_latest_device_folder(device_serial, device_folder):    # SSH server details    remote_folder = device_folder       serial_number = device_serial      print(f"device path: {remote_folder}")    try:        # Create an SSH client        ssh_client = paramiko.SSHClient()        ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())        # Establish an SSH connection        ssh_client.connect(ssh_server, port=ssh_port, username=ssh_username, password=ssh_password)        # Get the latest folder        get_latest_folder = f"ls -t {remote_folder} | head -n 1"        stdin, stdout, stderr = ssh_client.exec_command(get_latest_folder)        latest_folder = stdout.read().decode().strip()        if latest_folder:            print(f"device latest folder: {latest_folder}")            latest_folder = f"{remote_folder}/{latest_folder}"            print(f"device latest log full path: {latest_folder}")        else:            print(f"no folders found")        # Close the SSH connection        ssh_client.close()

I have checked these posts but could not figure out the solution:

1. ssh execute a shell script with arguments
2. Python to call shell script with arguments
3. formatting a string for ssh argument - Python
4. Insert variable values into a string
5. How do I put a variable’s value inside a string (interpolate it into the string)?
6. How to write string literals in Python without having to escape them?
7. https://dnmtechs.com/writing-windows-paths-in-python-3-a-guide-to-string-literals/
8. How should I write a Windows path in a Python string literal?
9. Convert WindowsPath to String

Why does it work with passing the expression folder = "/home/server/device" or folder = '/home/server/device' but not with passing the variable folder? What am I missing? Where is the catch?