M2E error - "Authorisation token is hard expired. User needs to generate a new token for this application"

Problem

Here is the full error that I'm receiving from M2E.

"Authorisation token is hard expired. User needs to generate a new token for this application."


Solution

Check the details for the eBay account you are using for this listing. For example, if changed your password on eBay you may need to re-enter it in M2E Pro and re-authorise M2E Pro by generating a new token.