Identity Platform SMS Authentication Failure

I'm using identity platform to log a user in with MFA. i'm using the javascript sdk and i can see the network request to v2/accounts/mfaSignIn:start fails with the error below. recaptcha seems to work fine and mfaSignIn:start includes the recaptcha token. an earlier call to v3/relyingparty/verifyPassword also works fine and uses the same API key and service. it just started happening today and has been on and off, so i don't think it's something on my end. Logs explorer in the Cloud Console doesn't show any more information about the error. The error is occuring across multiple projects and multiple organizations.

"The phone verification request contains an invalid application verifier. The reCAPTCHA token response is either invalid or expired."

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