Norton expired pop up

Do you use Norton products on any of your computers - PC, Mac or iPad/iPhone (noting that AV is not amongst the Apps that are available from Norton for iPad/iPhone)? If you have installed any of the Norton Apps that are available for iPad, these will be linked to your active Norton product subscription (e.g., Norton 360).

Does the appearance of this popup correspond with accessing a particular website? If you don’t have a Norton App installed on your iPad - and you see this popup when accessing a specific website, this may be a malicious link that is attempting to install a payload or fool you into clicking a malicious link for nefarious purposes.

Whilst such warnings may be legitimate, more often than not, warnings of this type are associated with browser-based social manipulation attacks - such as phishing - where the warning is emulating the format of a genuine alert - the purpose being to attempt fraud or extortion. If the alert is unexpected, or cannot be reasonably explained, the best advice is to not interact with the warning - and simply close the browser.

Whilst your iPad is generally not directly susceptible to traditional malware per-se, there are risks to which you are exposed. There are a variety of ways to mitigate these risks, one of the easiest and effective being the installation of a good Content blocker product. One of the better choices, specifically designed for iPad/iPhone/Mac, is 1Blocker:

https://apps.apple.com/gb/app/1blocker-privacy-ad-blocker/id1365531024

1Blocker is highly configurable - and crucially does not rely upon an external proxy-service of dubious provenance. All processing takes place on your device - and contrary to expectations, Safari will run faster and more efficiently. 

Unwanted content is not simply filtered after download (a technique used by basic/inferior products), but instead undesirable embedded content blocked form download. A further benefit on metered services, such as cellular connections where you data may be capped or chargeable, this not only improves speed but also saves you money.

When using a good Content Blocker, a high proportion of otherwise inescapable risk when using your Safari browser, or linking to external sources from email, is effectively mitigated before it even reaches you.

I hope this information and guidance proves to be helpful in resolving any issues.

Given that you don’t use Norton products - and don’t have any active subscriptions with Norton - this would strongly suggest that a fake alert with malicious intent is being generated.

Forewarned is forearmed.