Code to reproduce a Sequelize "incorrect syntax" issue.

syntax-issue.js

#!/usr/bin/env node
// -*- mode:javascript; indent-tabs-mode:t; js-indent-level:8; -*-

'use strict'
var Sequelize = require('sequelize');

const
Wei_DEV = {
        host:           "<server-DNS-name>",
        dialect:        "mssql"
},
user =         "<username>",
password =     "<password>"

const
Descriptor = {
        indexes:        [
                {
                        unique: true,
                        fields: [ 'IpAddress', 'port' ]
                }
        ],
        //tableName:    "lookup.networking.port.description",
        tableName:      "lookup-networking-port-description",
        timestamps:     true,
        comment:        "This table is intended to be a lookup table from (IP, port) => description."
},
fields = {
        IpAddress:      {
                type:           Sequelize.STRING,
                length:         16,
                allowNull:      false
        },
        port:   {
                type:           Sequelize.STRING,
                length:         16,
                allowNull:      false
        },
        description:            {
                type:           Sequelize.STRING,
                allowNull:      false
        }
}

var dbx = new Sequelize('Wei_DEV', user, password, Wei_DEV)
var lookup = dbx.define('Descriptor', fields, Descriptor)

lookup.sync()

/*
Test 1: with 'lookup.networking.port.description'
$ ./syntax.js
Executing (default): IF OBJECT_ID('[lookup.networking.port.description]', 'U') IS NULL CREATE TABLE [lookup.networking.port.description] ([id] INTEGER NOT NULL IDENTITY(1,1) , [IpAddress] NVARCHAR(255) NOT NULL, [port] NVARCHAR(255) NOT NULL, [description] NVARCHAR(255) NOT NULL, [createdAt] DATETIME2 NOT NULL, [updatedAt] DATETIME2 NOT NULL, PRIMARY KEY ([id]));
Executing (default): EXEC sys.sp_helpindex @objname = N'[lookup.networking.port.description]';
Executing (default): CREATE UNIQUE INDEX [lookup.networking.port].[description__ip_address_port] ON [lookup.networking.port].[description] ([IpAddress], [port])
Unhandled rejection SequelizeDatabaseError: Incorrect syntax near '.'.
    at Query.formatError (/usr/lib/node_modules/sequelize/lib/dialects/mssql/query.js:250:10)
    at Request.userCallback (/usr/lib/node_modules/sequelize/lib/dialects/mssql/query.js:82:25)
    at Request.callback (/usr/lib/node_modules/tedious/lib/request.js:33:27)
    at Connection.message (/usr/lib/node_modules/tedious/lib/connection.js:1179:27)
    at Connection.dispatchEvent (/usr/lib/node_modules/tedious/lib/connection.js:519:45)
    at MessageIO.<anonymous> (/usr/lib/node_modules/tedious/lib/connection.js:439:23)
    at emitNone (events.js:80:13)
    at MessageIO.emit (events.js:179:7)
    at ReadablePacketStream.<anonymous> (/usr/lib/node_modules/tedious/lib/message-io.js:92:15)
    at emitOne (events.js:90:13)
    at ReadablePacketStream.emit (events.js:182:7)
    at readableAddChunk (/usr/lib/node_modules/tedious/node_modules/readable-stream/lib/_stream_readable.js:210:18)
    at ReadablePacketStream.Readable.push (/usr/lib/node_modules/tedious/node_modules/readable-stream/lib/_stream_readable.js:169:10)
    at ReadablePacketStream.Transform.push (/usr/lib/node_modules/tedious/node_modules/readable-stream/lib/_stream_transform.js:123:32)
    at ReadablePacketStream._transform (/usr/lib/node_modules/tedious/lib/message-io.js:57:16)
    at ReadablePacketStream.Transform._read (/usr/lib/node_modules/tedious/node_modules/readable-stream/lib/_stream_transform.js:159:10)

Test 2: with 'lookup-networking-port-description'
$ ./syntax.js
Executing (default): IF OBJECT_ID('[lookup-networking-port-description]', 'U') IS NULL CREATE TABLE [lookup-networking-port-description] ([id] INTEGER NOT NULL IDENTITY(1,1) , [IpAddress] NVARCHAR(255) NOT NULL, [port] NVARCHAR(255) NOT NULL, [description] NVARCHAR(255) NOT NULL, [createdAt] DATETIME2 NOT NULL, [updatedAt] DATETIME2 NOT NULL, PRIMARY KEY ([id]));
Executing (default): EXEC sys.sp_helpindex @objname = N'[lookup-networking-port-description]';
Executing (default): CREATE UNIQUE INDEX [lookup-networking-port-description__ip_address_port] ON [lookup-networking-port-description] ([IpAddress], [port])
*/