Sharepy auth key error when accessing cookies dictionary

[alexilyin1]

Our team had been using sharepy to read/write files to our org's Sharepoint site for multiple years now. Out of the blue, sharepy auth started to fail on the following code blocker

sharepy.connect("companyname.sharepoint.com", username=username, password=password) with the following traceback

File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/sharepy/session.py", line 15, in connect
    return SharePointSession(site, auth=autoauth)
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/sharepy/session.py", line 61, in __init__
    self.auth.login(self.site)
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/sharepy/auth/spol.py", line 26, in login
    self._get_cookie()
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/sharepy/auth/spol.py", line 60, in _get_cookie
    cookie = self._buildcookie(response.cookies)
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/sharepy/auth/spol.py", line 91, in _buildcookie
    return 'rtFa=' + cookies['rtFa'] + '; FedAuth=' + cookies['FedAuth']
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/requests/cookies.py", line 334, in __getitem__
    return self._find_no_duplicates(name)
  File "/Users/alex.ilyin/.pyenv/versions/dwh/lib/python3.10/site-packages/requests/cookies.py", line 413, in _find_no_duplicates
    raise KeyError(f"name={name!r}, domain={domain!r}, path={path!r}")
KeyError: "name='rtFa', domain=None, path=None"

Anyone have background on this error?

[joesinger47]

Can confirm. Same problem here. Started around 2025-08-18 15:00 Eastern Time.

Looks like Microsoft disabled SAML authentication. Username and Password will no longer work.
This deprecation was apparently planned.
We'll have to move to a library that supports Azure AD clientid/clientsecret auth.

[christianll9]

We'll have to move to a library that supports Azure AD clientid/clientsecret auth.

Any suggestion?

[Jamie-]

More info:

• SharePoint Online SAML Auth Broken - Migrate to Azure AD vgrem/office365-rest-python-client#981
• https://devblogs.microsoft.com/microsoft365dev/migrating-from-idcrl-authentication-to-modern-authentication-in-sharepoint/
• https://techcommunity.microsoft.com/blog/microsoftmissioncriticalblog/legacy-sharepoint-authentication-idcrl-is-retiring-%E2%80%94-what-to-do-before-may-1-202/4499131

I haven't dug very far into it, but it might be better to migrate to Office365-REST-Python-Client as looks like support is already there for other types of auth.