There is bug with the selection of the data to match an Ingress overclock attempt to. Try other portals in the vicinity of your candidate, one might work. I’ve reported this as Ingress Bug, after a week with no answer posted it to Reddit (Reddit - The heart of the internet) and scaniverse community (Test scans with scaniverse succeed, localization with Ingress fails - Bug Reports - Niantic Scaniverse Community)
On Reddit others confirmed the issue and they also found portals where scaniverse worked but for Ingress overclock to succeed one hast to scan a different portal.
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