When you’re configuring SAML for Matomo, you may get the following error: Invalid array settings sp_certs_not_found_and_required. This means that you have enabled the signature features (which requires SP public certificate/ private key) but they were not provided in the SAML settings “Advanced” section. You can see our guide for the Advanced section here. If your administrator doesn’t have a public cert /private key to be used and doesn’t want to purchasing one, you can use self-signed certificate (free). In order to generate self-signed certificate can use for example this tool.