How would I link an existing Clerk user account to a new UGS player ID? | Official Unity Discord | Page 1

cursive crypt Jul 10, 2025, 12:15 AM

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Recently, Clerk auth now allows developers to host OpenID Connect to Clerk.
I have already set up Clerk and its Oauth, with the application credentials.
Clerk is already linked to UGS identity provider list in my project.

How would I make it so that existing Clerk accounts can log in to my Unity app that has UGS?

I plan on using Clerk for player authentication for more control and it has support for OpenID Connect, meaning that I can have players to login to Unity apps that are on different UGS projects, and across different future web apps.

But I am having trouble because, UGS web API does not seem to support OpenID Connect Accounts, and there isn't anything in the documentation to link an existing Open ID Connect account to a new UGS player ID or an existing OpenID Connect account to an already existing UGS player ID.

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There doesn't seem to be a UGS web api to create a new account through OpenID Connect.

rich lotus Jul 10, 2025, 12:27 AM

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You would need the OIDC name and Issuer URL to set up OpenID Connect

You have to pass the provider name and id token to SignInWithOpenIdConnectAsync()

OpenID Connect

cursive crypt Jul 10, 2025, 12:39 AM

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rich lotus You would need the OIDC name and Issuer URL to set up [OpenID Connect](https://d...

Ok, I am trying to test it with UGS Web API. (I need users to login through a web application later).

https://services.docs.unity.com/player-auth/v1/#tag/Player-Authentication/operation/LinkExternalId

But I am getting a 400 error, I think it's because I don't know what to put in for idProvider value

Unity Services Web API docs

rich lotus Jul 10, 2025, 12:43 AM

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the provider is the oidc provider name. it should start with oidc-

cursive crypt Jul 10, 2025, 12:44 AM

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sorry, I figured out that idProvider should be the issuer url.

cursive crypt Jul 10, 2025, 12:44 AM

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rich lotus the provider is the oidc provider name. it should start with `oidc-`

the docs doesn't say, but I think it is the issuer url.

rich lotus Jul 10, 2025, 12:48 AM

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good to know

cursive crypt Jul 10, 2025, 1:00 AM

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rich lotus good to know

sorry, you were right.

it actually was oidc-
I'm just trying out different values, because the documentation doesn't really tell me what to do with Clerk OpenID Connect.

I am a bit stuck on what values to use for it to work

rich lotus Jul 10, 2025, 1:17 AM

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cursive crypt sorry, you were right. it actually was ```oidc-``` I'm just trying out differen...

i believe the key that it wants is the ID Token you get from clerk.

cursive crypt Jul 10, 2025, 2:12 AM

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what would invalid audience mean?

rich lotus Jul 10, 2025, 2:45 AM

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cursive crypt what would invalid audience mean?

You can see that error here
https://docs.unity.com/ugs/en-us/manual/authentication/manual/common-errors#api-error-responses

Common errors

cursive crypt Jul 10, 2025, 4:14 AM

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Update. I think I got it to work.

It took 4 hours total to figure this out.

The specific token its looking for is a Clerk Id token that was signed in using the Clerk OAuth with a scope of openid.

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Btw. I think it would be really good if Unity integrated more closely with Clerk Auth and its OpenID Connect.

Clerk Auth is very new and was released less than a year ago, but I think the features Clerk has would be really good with UGS. Going to test it out further.

#How would I link an existing Clerk user account to a new UGS player ID?