agent-sessions not available if Gitlab Duo "Off by default" on instance, but "On" on project or group

Summary

On Gitlab EE On prem with Omnibus:

If Gitlab Duo Core is configured as "Off By Default", the Agent session menu will give a 404 even if Gitlab Duo Core is enabled on the Group or on the Project

It works if Gitlab Duo Core is "On By Default" on the instance

Steps to reproduce

1. Go to Admin > Gitlab Duo > Change Configuration
2. Put "GitLab Duo availability" to "Off by default"
3. Check "Gitlab Duo Core" "Turn on Web and IDE features"
4. Check "Feature preview" "Turn on experiment and beta GitLab Duo features"
5. Check "Flow execution" "Allow flow execution"
6. Check "Prompt Cache" "Turn on prompt caching"
7. Go to the project you want to enable Gitlab Duo Core > Settings / General / Gitlab Duo
8. Enable Gitlab Duo
9. Enable Allow Flow Execution

"Automate / Agent session" menu will be available, but will show a 404.

What is the current bug behavior?

• "Automate / Agent session" shows a 404 Page not found.
• Issues shows the "Generate MR with Duo" button
• By clicking on this button, it will create an empty Merge request

What is the expected correct behavior?

It should show the agent sessions list

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:		Ubuntu 24.04
Proxy:		no
Current User:	git
Using RVM:	no
Ruby Version:	3.2.8
Gem Version:	3.7.1
Bundler Version:2.7.1
Rake Version:	13.0.6
Redis Version:	7.2.10
Sidekiq Version:7.3.9
Go Version:	unknown

GitLab information
Version:	18.4.1-ee
Revision:	270836848e7
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	16.10
URL:		https://[MASKED]
HTTP Clone URL:	https://[MASKED]/some-group/some-project.git
SSH Clone URL:	git@[MASKED]:some-group/some-project.git
Elasticsearch:	no
Geo:		no
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: saml

GitLab Shell
Version:	14.45.2
Repository storages:
- default: 	unix:/var/opt/gitlab/gitaly/gitaly.socket
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell

Gitaly
- default Address: 	unix:/var/opt/gitlab/gitaly/gitaly.socket
- default Version: 	18.4.1
- default Git Version: 	2.50.1

Results of GitLab application Check

Expand for output related to the GitLab application check

Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Database config exists? ... yes
Tables are truncated? ... skipped
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Cable config exists? ... yes
Resque config exists? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
1/1 ... yes
360/2 ... yes
1/3 ... yes
1/4 ... yes
360/5 ... yes
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360/8 ... yes
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21/40 ... yes
1/43 ... yes
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360/202 ... yes
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1/249 ... yes
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360/255 ... yes
56/256 ... yes
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101/272 ... yes
360/273 ... yes
46/274 ... yes
1/275 ... yes
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81/280 ... yes
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56/288 ... yes
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453/372 ... yes
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361/379 ... yes
432/380 ... yes
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86/445 ... yes
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425/447 ... yes
90/448 ... yes
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427/460 ... yes
86/461 ... yes
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425/472 ... yes
427/473 ... yes
361/474 ... yes
46/475 ... yes
44/476 ... yes
42/477 ... yes
425/478 ... yes
44/479 ... yes
44/480 ... yes
46/481 ... yes
425/482 ... yes
Redis version >= 6.2.14? ... yes
Ruby version >= 3.0.6 ? ... yes (3.2.8)
Git user has default SSH configuration? ... yes
Active users: ... 17
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes
Elasticsearch version 7.x-9.x or OpenSearch version 1.x-3.x ... skipped (advanced search is disabled)
All migrations must be finished before doing a major upgrade ... skipped (Advanced Search is disabled)
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished