[Bug] Public Client AcquireTokenInteractive errors with requirement for client_assertion or client_secret

[colinhuckstep]

Which version of MSAL Go are you using?
Note that to get help, you need to run the latest version.

Where is the issue?

• Public client
  • Device code flow
  • Username/Password (ROPC grant)
  • Authorization code flow
• Confidential client
  • Authorization code flow
  • Client credentials:
    • client secret
    • client certificate
• Token cache serialization
  • In-memory cache
• Other (please describe)
  AcquireTokenInteractive

Is this a new or an existing app?
Existing application we are trying to migrate from ADFS to EntraID.

What version of Go are you using (go version)?

go version go1.23.0 windows/amd64

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
set GOHOSTARCH=amd64
set GOHOSTOS=windows

Repro

func getSAMLTokenFromEntraID(client *http.Client) (string, error) { scopes := []string{entra.MiddletierId + "/.default"} app, err := public.New(entra.Id, public.WithHTTPClient(client)) if err != nil { log.Errorf("Error creating EntraID Login App: %v", err) } authTokenResult, err := app.AcquireTokenInteractive(context.Background(), scopes, public.WithTenantID(entra.TenantId)) if err != nil { log.Fatalf("Error getting token: %v", err) } return authTokenResult.AccessToken, err }

Expected behavior
An access token should be returned.

Actual behavior
An error is thrown:

The request body must contain the following parameter: 'client_assertion' or 'client_secret'.

These are not valid options for a public client.

Possible solution

Additional context / logs / screenshots
FATAL: Error getting token: could not retrieve token from auth code: http call(https://login.microsoftonline.com/{{ tenant }}/oauth2/v2.0/token)(POST) error: reply status code was 401:
{"error":"invalid_client","error_description":"AADSTS7000218: The request body must contain the following parameter: 'client_assertion' or 'client_secret'. Trace ID: {{ redacted }} Correlation ID: {{ redacted }} Timestamp: 2024-09-16 17:29:30Z","error_codes":[7000218],"timestamp":"2024-09-16 17:29:30Z","trace_id":"{{ redacted }}","correlation_id":"{{ redacted }}","error_uri":"https://login.microsoftonline.com/error?code=7000218"}