Invalid token, unable to import .csv to Add 'External Contacts' in Company Info / Account Settings

Getting an 'Invalid Token' error when trying to upload .csv file to Add Contacts/import external contacts.

I made sure to downloaded the 'CSV Sample'  which I used to prepare the .CSV file that I'm trying to upload

I'm on a time crunch to complete the Zoom Phone setup for my organization by the end of the day and need help resolving.  Could someone please help me at your earliest convenience?