Unable to enable "Sign In with Apple" on Service ID – 501 PATCH Unsupported Request

Hello,

I’m trying to set up Sign In with Apple for my Firebase Authentication integration.

Steps I followed:

Created a Service ID in Apple Developer, e.g. com.example.myapp.signin.

Tried to enable Sign In with Apple and configure the Web Authentication Configuration.

Web Domain: myapp.firebaseapp.com

Return URL: https://myapp.firebaseapp.com/__/auth/handler

When I click Save, I get the following error in the browser console and a blank response page:

Unsupported Request PATCH to http://developer.apple.com/services-account/v1/bundleIds/XXXXXXXX not supported. Reference #...

What I have verified so far:

My Apple Developer Program membership is active (paid).

My App ID (e.g. com.example.myapp) exists in Identifiers.

The App ID has Sign In with Apple capability checked.

I need to link the Service ID with this App ID for Firebase web-based auth.

Goal: Complete setup of Apple as a sign-in provider in Firebase Authentication. To do this, Apple requires me to add the Firebase return URL above, but the Developer Portal prevents saving with the 501 error.

Has anyone else run into this, and is there a workaround (e.g. enabling via Xcode, App Store Connect, or other methods)? Is this a known bug with the Apple Developer Portal?

Here is the screenshot of the error:

And Response part:

<HTML><HEAD> <TITLE>Unsupported Request</TITLE> </HEAD><BODY> <H1>Unsupported Request</H1> PATCH to http&#58;&#47;&#47;developer&#46;apple&#46;com&#47;services&#45;account&#47;v1&#47;bundleIds&#47;N********* not supported.<P> Reference&#32;&#35;8&#46;a6cf3617&#46;1*********&#46;6****** <P>https&#58;&#47;&#47;errors&#46;edgesuite&#46;net&#47;8&#46;a*******&#46;1*********&#46;6******</P> </BODY></HTML>

Thanks in advance!

I have the same problem as @isa_imadoglu2, same steps and outcome when trying to enable a new capability.

When I enable "Associated Domains" and click Save, I get a 501 error and the change doesn’t persist after refresh:

Response:

PATCH to http://developer.apple.com/services-account/v1/bundleIds/PBB2JSKG7Y not supported.

Reference #8.5941602.1755400657.8a713a7

Then the changes don't persist on page refresh.

I also tried creating a brand-new Identifier and see the same error.

I had the same issue and when I tried from another internet network the save worked

Unable to enable "Sign In with Apple" on Service ID – 501 PATCH Unsupported Request
 
 
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