It might be worth telling your employer the app told you to isolate but you have since had to restore your phone and have lost that info. You could then try to get a covid test which will determine whether you have it or not. You could contact 111 and explain and they might be able to sort something for you.
ETA - your employer will obviously just have to understand that you'll need to be off isolating until your results come in.
ETA - your employer will obviously just have to understand that you'll need to be off isolating until your results come in.
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