Tried setting this option: Wordfence tables and data on deactivation?
Deactivating, deleting.
Then added plugin, activated and ran scan but still get this error after about 15 minutes of scanning
Scan Engine Error: Wordfence could not start a scan because the cron key does not match the saved key.
Error raided when
Scanning file contents for infections and vulnerabilities
Scanning files for URLs in Google's Safe Browsing List