I bought a new up to date system 3 months ago so there is no reason why it shouldn't be
Log says this
for IPN payload: cmd=_notify-validate
[2021-08-24 08:07 America/New_York] HTTP response of validation request: HTTP/1.1 200 OK
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: text/html; charset=UTF-8
Paypal-Debug-Id: a10390a97e208
X-Frame-Options: SAMEORIGIN
DC: phx-origin-www-2.paypal.com
X-Akamai-Transformed: 9 - 0 pmb=mRUM,1
Date: Tue, 24 Aug 2021 12:07:17 GMT
Content-Length: 7
Connection: close
Set-Cookie: cwrClyrK4LoCV1fydGbAxiNL6iG=7UXZoYc0jGE0RfggRo2TIku499lV_ZpkwXuko-lbAbq_kZixTelLui66z9_ARWP65AGDNoj2VrntyiKG8zqW7qfOjsEt43FK3A-sLcNPyZNYPOB3W5dVlAzmIz6iv0SQg-DiKXwXVr2npMXJINP-EFmOoTSz2TTfNX2OkE-072eCa_ZOYb_BVJs_oPLlcQyFhFB7gMnajuE2YoB6mkYL39c5Eh8Z9zCPOvOnpXDtMI5VehH6cNTy23v7cIvSv90XLZiSs1suEeC0BUZvFTNcpJvoMPKTqtUQX9z6sXkyM0QnucvwaeIOFky_uiBtbva94l6aO345g8q4VyuKYiSGaMs_ggMBC2g4JgmZkfOdwf0PG-hqffVwD97v8pJwCwzk8AyzNBZSrn5cdkR8zPV4OEoGS4KkWiII7sFs3ba9BApXQZ0HKwc0T_T_b7y; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: cookie_check=yes; expires=Fri, 22-Aug-2031 12:07:17 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: navcmd=_notify-validate; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: navlns=0.0; expires=Thu, 24-Aug-2023 12:07:17 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: l7_az=dcg14.slc; Path=/; Domain=paypal.com; Expires=Tue, 24 Aug 2021 12:37:17 GMT; HttpOnly; Secure
Set-Cookie: ts=vreXpYrS%3D1724501236%26vteXpYrS%3D1629808636%26vr%3D780ebc5617b0aa112b2d29a5ff69bfdb%26vt%3D780ebc5617b0aa112b2d29a5ff69bfda%26vtyp%3Dnew; Path=/; Domain=paypal.com; Expires=Fri, 23 Aug 2024 12:07:17 GMT; HttpOnly; Secure
Set-Cookie: ts_c=vr%3D780ebc5617b0aa112b2d29a5ff69bfdb%26vt%3D780ebc5617b0aa112b2d29a5ff69bfda; Path=/; Domain=paypal.com; Expires=Fri, 23 Aug 2024 12:07:17 GMT; Secure
Set-Cookie: x-cdn=akamai; path=/; domain=.paypal.com; secure
Server-Timing: edge; dur=9
Server-Timing: origin; dur=1074
Server-Timing: cdn-cache; desc=MISS
Set-Cookie: akavpau_ppsd=1629807437~id=6f495ed4510161867a2c8b04a264193e; Domain=www.paypal.com; Path=/; HttpOnly; Secure; SameSite=None
Strict-Transport-Security: max-age=63072000
INVALID
[2021-08-24 08:07 America/New_York] Invalid IPN: cmd=_notify-validate