notify_url stopped working in sandbox mode

[dc1000]

My website has been working well for many years, using Payment Standard html form based API in Live mode and Sandbox mode, ie.

<form name="some_name" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="notify_url" value="http://www.some_url.php"/>

For sandbox mode I change the action to "https://www.sandbox.paypal.com/cgi-bin/webscr" 

However, I just went to test a payment in sandbox mode today, and my notify_url did not get called.  It does get called in Live mode.  Has something changed on PayPal in the last few months?  Any ideas what I could check?

[dc1000]

Forgot to add my merchant IDs:

PayPal Merchant ID (Sandbox): 3GKJXXEWLHYZ6
PayPal Merchant ID (Live): VL4SRGWSFZZKG

[MTS_Justin]

Hello,

Unfortunately this is a known issue at the moment.

Please follow this thread to be updated when the issue is resolved.

Apologies for any inconvenience.

Thanks !