Can you see other SSIDs using your phone? Or do no wifi SSIDs show at all? (E.g. your neighbour is likely to have a wifi router that your mobile should detect.)
Is the working phone able to setup a wifi hotspot to see if the faulty phone is able to see the wifi hotspot?
That "Laptop, ipad and TV appear to be ok" and your husband's phone is fine would suggest whatever the issue, if there is an issue, lies with your mobile phone. 😀
Before resetting phone, you could additionally just put it in airplane mode, turn on wifi and see if you see any wifi access points at all. If you live in a built-up area there should be lots around and the wifi access points you see should match the ones shown by your husband's phone. Only by making a change such as a reset of some sort can you expect anything different. Be careful that you do not lose any unique and important data on your phone. I do agree that a full factory reset does seem to be rather excessive and I don't recall in the last decade needing to take such a step (perhaps just reboot first?).
Edit: has any configuration taken place on the EE router to disable the longer-range 2.4 GHz radio? Is there anything in the SSID name which suggests you are trying to connect on the shorter-range 5.0 GHz radio? (If the router has this functionality.)
