I've ran into this issue many times. Some integrations require a security token. However, there are trusted IP ranges enabled for the org and when those are enabled, you won't see the reset token link when logged in from an address in a trusted range. To get around this, use the following URL: https://[replaceThisWithYourSalesforceOrgDomainHere]/_ui/system/security/ResetApiTokenEdit?retURL=%2Fui%2Fsetup%2FSetup%3Fsetupid%3DPersonalInfo&setupid=ResetApiToken Just make sure that you're logged in as the user you want to reset. Presto chango! It's a lifesaver.
Quick tips and tutorials on Salesforce to help you develop on the platform. Some things you need to do "because Salesforce". #bcsf