Signature Invalid occur often

I am getting a signature and also can able to join the meeting after the end of one meeting.
creating another meeting that time I am getting the signature invalid issue.
kindly some buddy help me.

below i have mentioned the signature generate function.

1] How we can identify whether the particular signature is valid for certain time ? OR Expiry logic ?
2] Is there any time conversion / Offset is required to generate the signature ?
3] How signature gets validated on zoom server, I mean what kind of parameter consider while checking the signature in order to run the zoom meeeting ?

private static long ToEpoch(DateTime value) => (value.Ticks - 621355968000000000) / (10000 * 1000);

    public static string GenerateZoomSdkToken(string sdkKey, string sdkSecret, string meetingNumber,string role)
        var now = DateTime.UtcNow;

        int roleId = Convert.ToInt32(role);
        Int64 MeetingNumber = Convert.ToInt64(meetingNumber);

        var iat = ToEpoch(now);
       // var exp = ToEpoch(now.AddMinutes(2));
        var exp = ToEpoch(now.AddMinutes(10));

        // Create Security key  using private key above:
        var securityKey = new Microsoft.IdentityModel.Tokens.SymmetricSecurityKey(Encoding.UTF8.GetBytes(sdkSecret));

        // length should be >256b
        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        //Finally create a Token
        var header = new JwtHeader(credentials);

        var zoomPayload = new JwtPayload{
            {"sdkKey", sdkKey},
            {"mn", MeetingNumber},
            {"role", roleId},
            {"iat", iat},
            {"exp", exp},
            {"tokenExp", exp}

        var secToken = new JwtSecurityToken(header, zoomPayload);
        var handler = new JwtSecurityTokenHandler();

        // Token to String so you can use it in your client
        var tokenString = handler.WriteToken(secToken);

        return tokenString;

Hi @nirmaltiwari139 ,

I want to make sure I’m understanding what’s going on correctly. Your signature is working to join one meeting, but when you create a new meeting, it’s no longer valid. Is this correct? If so, how close together, time-wise, are the meetings being created? I ask this to see if it may have anything to do with the token expiring, which I think you were also getting at.