I've hit a dead end with normal Apple support channels. I wrote up a radar for it (FB23333685).
I used curl -v https://developer.apple.com/forums/ on my Mac via my phone's hotspot (working) and via Spectrum (not working) (some irrelevant stuff elided to shrink post):
Working:
% curl -v https://developer.apple.com/forums/
* Host developer.apple.com:443 was resolved.
* IPv6: 2620:149:a06:f000::134, 2620:149:a06:f000::139
* IPv4: 17.253.31.140, 17.253.31.139
* Trying [2620:149:a06:f000::134]:443...
* Connected to developer.apple.com (2620:149:a06:f000::134) port 443
<elided>
> GET /forums/ HTTP/1.1
> Host: developer.apple.com
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< Server: Apple
< Date: Mon, 22 Jun 2026 23:22:30 GMT
< Content-Type: text/html;charset=utf-8
< Vary: Accept-Encoding
< Set-Cookie: oid-dev-forums=; Path=/; Domain=.apple.com; Expires=Thu, 01 Jan 1970 00:00:00 GMT; Max-Age=0; Secure; HttpOnly
< Expires: Mon, 22 Jun 2026 23:22:29 GMT
< X-Frame-Options: DENY
< Strict-Transport-Security: max-age=31536000; includeSubDomains
< Service-Worker-Allowed: /
< User-Type: anonymous
< Cache-Control: private,no-cache,no-store, must-revalidate, max-age=0
< Last-Modified: Mon, 22 Jun 2026 23:22:29 GMT
< X-Content-Type-Options: nosniff
< Content-Security-Policy: <elided>
< Vary: Accept-Encoding
< X-XSS-Protection: 1; mode=block
< Vary: Origin
< Vary: Access-Control-Request-Method
< Vary: Access-Control-Request-Headers
< Content-Language: en-US
< X-Request-ID: 41b2b91a2a2c5e8be35787ec7b349db8
< Edge-Control: !no-store,max-age=3600
< X-Request-ID: 41b2b91a2a2c5e8be35787ec7b349db8
< Set-Cookie: myacinfo=; Path=/; Domain=.apple.com; Expires=Thu, 01 Jan 1970 00:00:00 GMT; Max-Age=0; Secure; HttpOnly
< Set-Cookie: asc_user=; Path=/; Domain=.apple.com; Expires=Thu, 01 Jan 1970 00:00:00 GMT; Max-Age=0; Secure
< Set-Cookie: XID=<redacted>; Path=/; Domain=.apple.com; Expires=Wed, 22 Jul 2026 23:22:29 GMT; Max-Age=2592000; Secure; HttpOnly
< Set-Cookie: df_shld_btm_prd=<redacted>; Expires=Tue, 23 Jun 2026 11:22:30 GMT; Max-Age=43200; Domain=apple.com; Path=/; SameSite=Lax; Secure
< Age: 2
< Via: https/1.1 ussea4-edge-mx-005.ts.apple.com (acdn/302.16436), https/1.1 ussea4-edge-fx-007.ts.apple.com (acdn/302.16436)
< X-Cache: miss, miss
< CDNUUID: 42f00814-9cfb-4675-a0fa-4f3aa5ba89da-2134634100
< Transfer-Encoding: chunked
< Connection: keep-alive
<
<!DOCTYPE html>
…
Failing:
% curl -v https://developer.apple.com/forums/
* Host developer.apple.com:443 was resolved.
* IPv6: (none)
* IPv4: 17.253.83.137, 17.253.83.132
* Trying 17.253.83.137:443...
* Connected to developer.apple.com (17.253.83.137) port 443
<redacted>
* SSL certificate verify ok.
* using HTTP/1.x
> GET /forums/ HTTP/1.1
> Host: developer.apple.com
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 403 Forbidden
< Server: Apple
< Date: Mon, 22 Jun 2026 23:16:25 GMT
< Content-Type: text/html
< Content-Length: 146
< Cache-Control: private, no-cache, no-store, max-age=0
< Age: 0
< Via: https/1.1 uslax1-edge-mx-005.ts.apple.com (acdn/302.16436), https/1.1 uslax1-edge-fx-015.ts.apple.com (acdn/302.16436)
< X-Cache: miss, miss
< CDNUUID: 4da2a4a9-3bd4-4135-b895-6b58b6d7f53b-1614544808
< Connection: keep-alive
<
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
<hr><center>Apple</center>
</body>
</html>
* Connection #0 to host developer.apple.com left intact
The Spectrum response never reached the forums app at all — it was rejected at the edge node itself (uslax1-edge-mx-005 / uslax1-edge-fx-015, both LA-area). The working request happened to land on a Seattle-area edge (ussea4) via anycast routing. So this isn't an app-level or account-level block — it's a deny rule sitting on (or upstream of) the LA edge PoP for my specific IP.
Thing is, I don’t know how to get help on this issue.