[BUG] Tenant is defaulting incorrectly based on the ordering of: opensearch_security.multitenancy.tenants.preferred

[derek-ho]

What is the bug?
Even when a default tenant is set, when logging in the default tenant selected still varies based on the value of opensearch_security.multitenancy.tenants.preferred. For example, if I have selected private as the default tenant but I have a value of opensearch_security.multitenancy.tenants.preferred set as ['Global', 'Private'], users will be automatically logged into the global tenant.
How can one reproduce the bug?
See above

What is the expected behavior?
Whatever is set as the default tenant should be logged in.
What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?
This issue existed for a while, but has become bigger impact due to recent changes that removed the tenant picker from automatically popping up if the default tenant is set.
Do you have any additional context?
No

[derek-ho]

Most likely culprit: https://github.com/opensearch-project/security-dashboards-plugin/blob/main/public/apps/login/login-page.tsx#L53

[derek-ho]

Actually here is the issue: https://github.com/opensearch-project/security-dashboards-plugin/blob/main/server/auth/types/authentication_type.ts#L179

[derek-ho]

https://github.com/opensearch-project/security-dashboards-plugin/blob/main/server/backend/opensearch_security_client.ts#L41

[stephen-crawford]

[Triage] Hi @derek-ho thank you for filing this issue. This seems like a good experience fix. Marking as triaged.