Recently been working on a process that uses the sharepoint online connector (package 1.7.1) to download, list, upload and delete files.

This is working as expected in FME Form (tested on both 2024.1 and 2025.1)

However, when this is deployed to FME Flow 2025.1 the sharepoint online connector that should download a file returns an error (but doesn’t cause the workspace to fail)

Error: SharepointOnlineConnector: Could not connect to server. Check that you are connected to the internet and that no firewall is blocking outbound connections.
(Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate in certificate chain (_ssl.c:1028)')))'

The workspace continues and the sharepoint online connectors that are listing and uploading items work as expected.

It’s been tested on another similar FME Flow environment that has not yet been upgraded to FME 2025 and the error does not exist and the file is downloaded.

I’m not sure where the Sharepoint Online Connector might be looking for a certificate. Although it seems odd that it only affects the download option. Certificates are issued from an Enterprise CA so there’s various cacerts files that have been altered to get other connections working, but I know there are few different locations. Just not sure which for this connector.

In the FME environment where the SharepointOnlineConnector doesn’t work, I am able to download the same file via a rest api call. 

I suspect this is a fairly niche question, but on the off chance….