For Office Professional Plus 2019 Telephone Activation key, given the product’s nature and price, it is quite common for this key to encounter this error. 

Please contact our Customer Support Team via Support Tickets on your EF Dashboard so we can check if you are eligible for a refund or replacement. To assist you better, please include the details below:

1. Order / Transaction ID

2. Screenshot of the pop-up/error message '

3. Additional information (if any)