Why am I unable to authenticate with GNOME GitLab via OAuth?

[rokejulianlockhart (Mr. Beedell, Roke Julian Lockhart (RJLB))]

Although I am able to with gitLab.com:

1. #!/usr/bin/env sh
   glab auth login
   

2. - Signing into gitlab.com
   - glab config set -h gitlab.com git_protocol https
   ✓ Configured Git protocol.
   - glab config set -h gitlab.com api_protocol https
   ✓ Configured API protocol.
   ✓ Logged in as RokeJulianLockhart
   ✓ Configuration saved to /home/beedell.roke_julian_lockhart/.config/glab-cli/config.yml
     - Host: gitlab.com
   

…I am unable to at gitLab.GNOME.org:

1. ┃ Found GitLab instances in git remotes. Select one:
   ┃ > gitlab.gnome.org (origin)
   ┃   Enter a different hostname
   

2. - Signing into gitlab.gnome.org
   ┃ How would you like to sign in?
   ┃   Token
   ┃ > Web
   

3. - Signing into gitlab.gnome.org
   ┃ What domains does this host use for the container registry and image dependency proxy?
   ┃ > gitlab.gnome.org,gitlab.gnome.org:443,registry.gitlab.gnome.org
   

4. - Signing into gitlab.gnome.org
             
      ERROR  
             
     Set 'client_id' first with `glab config set client_id <client_id> -g --host gitlab.gnome.org`.
   

However, (HTTPS) token authentication succeeds:

- Signing into gitlab.gnome.org

The minimum required scopes are 'api' and 'write_repository'.
Generate a personal access token at https://gitlab.gnome.org/-/user_settings/personal_access_tokens?scopes=api,write_repository
- glab config set -h gitlab.gnome.org git_protocol https
✓ Configured Git protocol.
- glab config set -h gitlab.gnome.org api_protocol https
✓ Configured API protocol.
✓ Logged in as RokeJulianLockhart
✓ Configuration saved to /home/beedell.roke_julian_lockhart/.config/glab-cli/config.yml
  - Host: gitlab.gnome.org

My Environment

The server is GitLab Community Edition, v18.11.5, whereas my client is:

1. #!/usr/bin/env pwsh
   rpm -qf (Get-Command glab).Source --queryformat @'
   Name: %{NAME}
   Version: %{VERSION}
   Release: %{RELEASE}
   Architecture: %{ARCH}
   Install Date: %{INSTALLTIME:date}
   Size: %{SIZE}
   Signature: %{SIGPGP:pgpsig}
   Source RPM: %{SOURCERPM}
   Build Date: %{BUILDTIME:date}
   Build Host: %{BUILDHOST}
   Packager: %{PACKAGER}
   Vendor: %{VENDOR}
   '@ | yq -P
   

2. Name: glab
   Version: 1.91.0
   Release: 1.fc44
   Architecture: x86_64
   Install Date: Sat 13 Jun 2026 15:52:58 BST
   Size: 50518202
   Signature: (none)
   Source RPM: glab-1.91.0-1.fc44.src.rpm
   Build Date: Sat 04 Apr 2026 22:31:56 BST
   Build Host: buildvm-x86-18.rdu3.fedoraproject.org
   Packager: Fedora Project
   Vendor: Fedora Project