When logging in to Semgrep using SAML single-sign on (SSO), you may see the errorDocumentation Index
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Authentication method doesn't match requested:

admin in Semgrep AppSec Platform.
Sign in to Semgrep AppSec Platform.
Click Settings > Access > SSO.
Check the box labeled Check if your SSO supports non-password authentication mechanisms (e.g. MFA, X509, PasswordLessPhoneSignin).