SecureAuth cause - ShareplumRequestError: Shareplum HTTP Post Failed : 403 Client Error: Forbidden for url

We are trying to access sharepoint and we are succeeding depending on whether or not the specific sharepoint section is protected with "SecureAuth".

The program works fine if the url is not protected with "SecureAuth", but if this URL is protected with "SecureAuth" it returns this error. Is there any way to fix it?

We are using:

 from shareplum import Site
 from shareplum import Office365
 from shareplum.site import Version

 authcookie = Office365(sharepoint_address, username=sharepoint_user,\
                        password=sharepoint_user_pw).GetCookies()
 site = Site(f"https://myWeb.com/sites/{sharepoint_site}/", version=Version.v365, authcookie=authcookie)
 folder = site.Folder(sharepoint_folder) # here come the error

Depending of {sharepoint_site} its working or not.

Its the same error but its not related to that topic

from SecureAuth cause - ShareplumRequestError: Shareplum HTTP Post Failed : 403 Client Error: Forbidden for url