ID.me Firebase OIDC auth failing

What I've tried


protected async onOAuthProviderClick() {
const provider = new OAuthProvider('oidc.idme');
provider.addScope('openid');
try {
await signInWithRedirect(getAuth(), provider);
} catch (error) {
if (error instanceof FirebaseError) {
this.#snacks.open(`Error signing in with ID.me: ${error.message}`);
} else {
this.#snacks.open(
'An unknown error occurred while signing in with ID.me'
);
}
if (isDevMode()) console.error(error);
}
}


I created the oidc provider in firebase console, copied and pasted (and double checked) the client id and client secret. I also added the callback url to the redirect URIs in ID.me configuration for my app.

Problem


I'm getting the following message from a page on ID.me's domain (https://api.idmelabs.com/oauth/authorize?...):

Client authentication failed due to unknown client, no client authentication included, or unsupported authentication information
​

I haven't had a successful api call to ID.me yet, so I haven't been able to request production level. This is all through the sandbox.

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