Unfortunately, if you are an employee (Paid with a W2 and not a 1099), beginning with your 2018 Tax Return, you can no longer deduct "unreimbursed employee expenses".
The Tax Cuts and Jobs Act (TCJA) that was signed into law in December of 2017 eliminated all "Miscellaneous Itemized Deductions" formerly allowable on your Schedule A. This includes all "unreimbursed employee expenses", like professional development class fees and membership fees.
For more information, please check out the TurboTax FAQ below:
https://ttlc.intuit.com/replies/6971774