Potential solutions courtesy of Google:
You can simply try deleting and remapping the fingerprints stored on the device, and you can even store the same fingerprint twice, which has worked for some users.
In other cases, clearing the cache has done the trick. Go to Settings – General – Phone Management – Device Storage and tap on Internal Storage. Then tap on Cached Data and clear it.
Go to Settings->Smart Cleaning->Test Hardware, and keep hitting the test button for Fingerprint Sensor, it will usually (eventually) test good. That's when fingerprints start working.
Prior to testing good, it may go through 1-n "bad" tests. The first bad test shows a result of "No Response. Retest Component." After that, the result changes to "Not Responding. Contact a customer center." Eventually, though, it does seem to switch to a "Good" result, and fingerprints resume working.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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