I've seen this error listed a couple other times w/o any replies, so am going to try again. I had initially successfully created a webhook subscription, and was receiving events. After some time it seemed to stop so was going to delete/recreate the webhook subscription, but I cannot get the "View Subscription" request to work. I get the following error:
Client ID: 46678
Request: GET https://www.strava.com/api/v3/push_subscriptions?client_id=46678&client_secret={mySecret}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The request could not be satisfied</TITLE>
</HEAD>
<BODY>
<H1>403 ERROR</H1>
<H2>The request could not be satisfied.</H2>
<HR noshade size="1px">
Bad request.
We can't connect to the server for this app or website at this time. There might be too much traffic or a
configuration error. Try again later, or contact the app or website owner.
<BR clear="all">
If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
<BR clear="all">
<HR noshade size="1px">
<PRE>
Generated by cloudfront (CloudFront)
Request ID: -sl2xWMFlZLaF6xgBDiWU6sVQN-i5U5YNBVxcd8Fqn2blsQNcbf99g==
</PRE>
<ADDRESS>
</ADDRESS>
</BODY>
</HTML>