My wifes accounts got locked one time when we were doing some fundraising and using her PayPal account for some of the online stuff, while it was a pain, we provided the details and it was unlocked pretty quickly.
One of the clubs that I volunteer for has a PayPal account that’s used for legitimate club business and has been locked a number of times over the years when they ask for the same information (registration etc) which is easily provided. Again a pain but usually pretty quick and simple.
This used to happen more often in the early days when the account wasn’t used very often, these days it’s far far more active as more stuff has gone digital and we transact more online these days. I assume there was an automatic flag that says if thing X happens n+1 times, lock the account… and when you don’t do anything much n+1 = 1
Long story short, it’s very possible it’s legit. Do your own checks to make sure it is… the first would be logging into your paypal account and seeing if it’s locked… that would be a pretty good giveaway that it’s legit