Redirect Following Teams SSO Authentication

Meghana-MSFT For full disclosure, this is our current AuthStart page/script:

<script src="../Scripts/msteams-sdk-1.6.0.js"></script>
<script src="../Scripts/jquery-3.5.1.min.js"></script>
<script type="text/javascript">
    microsoftTeams.initialize();

    microsoftTeams.getContext(function (context) {
        let state = _guid();
        localStorage.setItem("auth.state", state);
        localStorage.removeItem("auth.error");

        let queryParams = {
            client_id: "@ViewBag.ClientId",
            response_type: "id_token token",
            response_mode: "fragment",
            scope: "https://graph.microsoft.com/User.Read openid profile offline_access",
            redirect_uri: window.location.origin + "/auth/msteamsSilentEnd",
            nonce: _guid(),
            state: state,
            login_hint: context.loginHint,
        };

        let authorizeEndpoint = `https://login.microsoftonline.com/${context.tid}/oauth2/v2.0/authorize?${toQueryString(queryParams)}`;
        window.location.assign(authorizeEndpoint);
    });

    function toQueryString(queryParams) {
        let encodedQueryParams = [];

        for (let key in queryParams) {
            encodedQueryParams.push(key + "=" + encodeURIComponent(queryParams[key]));
        }

        return encodedQueryParams.join("&");
    }

    function _decimalToHex(number) {
        var hex = number.toString(16);

        while (hex.length < 2) {
            hex = '0' + hex;
        }

        return hex;
    }

    function _guid() {
        var cryptoObj = window.crypto || window.msCrypto;
        if (cryptoObj && cryptoObj.getRandomValues) {
            var buffer = new Uint8Array(16);
            cryptoObj.getRandomValues(buffer);
            buffer[6] |= 0x40;
            buffer[6] &= 0x4f;
            buffer[8] |= 0x80;
            buffer[8] &= 0xbf;

            return _decimalToHex(buffer[0]) + _decimalToHex(buffer[1]) + _decimalToHex(buffer[2]) + _decimalToHex(buffer[3]) + '-' + _decimalToHex(buffer[4]) + _decimalToHex(buffer[5]) + '-' + _decimalToHex(buffer[6]) + _decimalToHex(buffer[7]) + '-' +
                _decimalToHex(buffer[8]) + _decimalToHex(buffer[9]) + '-' + _decimalToHex(buffer[10]) + _decimalToHex(buffer[11]) + _decimalToHex(buffer[12]) + _decimalToHex(buffer[13]) + _decimalToHex(buffer[14]) + _decimalToHex(buffer[15]);
        }
        else {
            var guidHolder = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
            var hex = '0123456789abcdef';
            var r = 0;
            var guidResponse = "";

            for (var i = 0; i < 36; i++) {
                if (guidHolder[i] !== '-' && guidHolder[i] !== '4') {
                    r = Math.random() * 16 | 0;
                }

                if (guidHolder[i] === 'x') {
                    guidResponse += hex[r];
                } else if (guidHolder[i] === 'y') {
                    r &= 0x3;
                    r |= 0x8;
                    guidResponse += hex[r];
                } else {
                    guidResponse += guidHolder[i];
                }
            }
            return guidResponse;
        }
    }
</script>

And this is the AuthEnd:

<script src="../Scripts/msteams-sdk-1.6.0.js"></script>
<script src="../Scripts/jquery-3.5.1.min.js"></script>
<script type="text/javascript">
    microsoftTeams.initialize();

    localStorage.removeItem("auth.error");
    let hashParams = getHashParameters();

    if (hashParams["error"]) {
        localStorage.setItem("auth.error", JSON.stringify(hashParams));
        microsoftTeams.authentication.notifyFailure(hashParams["error"]);
    } else if (hashParams["access_token"]) {
        let expectedState = localStorage.getItem("auth.state");

        if (expectedState !== hashParams["state"]) {
            localStorage.setItem("auth.error", JSON.stringify(hashParams));
            microsoftTeams.authentication.notifyFailure("StateDoesNotMatch");
        } else {
            let key = "auth.result";

            localStorage.setItem(key, JSON.stringify({
                idToken: hashParams["id_token"],
                accessToken: hashParams["access_token"],
                tokenType: hashParams["token_type"],
                expiresIn: hashParams["expires_in"]
            }));

            microsoftTeams.authentication.notifySuccess(key);
            window.location.href = "/Home/Index";
        }
    } else {
        localStorage.setItem("auth.error", JSON.stringify(hashParams));
        microsoftTeams.authentication.notifyFailure("UnexpectedFailure");
    }

    function getHashParameters() {
        let hashParams = {};
        location.hash.substr(1).split("&").forEach(function (item) {
            let s = item.split("="),
                k = s[0],
                v = s[1] && decodeURIComponent(s[1]);
            hashParams[k] = v;
        });
        return hashParams;
    }
</script>

Line #29 of the AuthEnd script is our culprit triggering the X-Frame issue on systems with multiple accounts.