### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

I enabled SSO and allowed only 3 (three) specific user to login and all other 9 (nine) are internal. However, now SSO users cannot login becase -7 (minus seven) are remaining:

<img width="873" height="424" alt="Image" src="https://github.com/user-attachments/assets/a9271723-103f-4ad0-b54b-0a79f7482078" />

### Steps to Reproduce

1. Deploy LiteLLM proxy 2. Configure SSO 3. Login with 3 users with SSO 4. Create 7 internal users 5. Try to login with SSO

### Relevant log output

```shell {"error":{"message":"You must be a LiteLLM Enterprise user to use SSO for more than 5 users. If you have a license please set `LITELLM_LICENSE` in your env. If you want to obtain a license meet with us here: https://enterprise.litellm.ai/demo You are seeing this error message because You set one of `MICROSOFT_CLIENT_ID`, `GOOGLE_CLIENT_ID`, or `GENERIC_CLIENT_ID` in your env. Please unset this","type":"auth_error","param":"premium_user","code":"403"}} ```

### What part of LiteLLM is this about?

UI Dashboard

### What LiteLLM version are you on ?

v1.90.0

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