A friend of mine has the track and trace app on his phone. He regularly gets messages saying that he may have been in contact with the virus but when he clicks into it, it disappears, no info, nothing.

New trials of the app were launched in August before the app was officially launched in England and Wales in September – the last countries in the UK to have an app available.

But within days of its launch an urgent fix was needed when it was revealed thousands of test results could not be linked to the app.

Users said the messages were worrying and caused confusion over whether they had been exposed and needed to isolate or get a test.

Last week’s updates aimed to remove these notifications. A DHSC spokesperson confirmed official notifications from the app won’t disappear when a user clicks on them and will provide appropriate advice.

That's a known error and should have been rectified:

https://www.digitalhealth.net/2020/1...ed-to-isolate/