[MM-57877] Fix issue #26841

[MeHow25]

Summary

Display a clear and user-friendly message when the user tries to create a new team on an already existing URL.

Ticket Link

Fixes #26841
Jira https://mattermost.atlassian.net/browse/MM-57877

Screenshots

before	after

Release Note

Fix GH-26841

[mattermost-build]

Hello @MeHow25,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

[hanzei]

LGTM 👍

Thanks for the contribution

[unified-ci-app]

Enterprise tests are not yet completed. You need to wait until Enterprise CI/docker-image status check is successful, before triggering E2E tests.

[hmhealey]

Thanks for the PR! This looks good to me. I was expecting this to be changed on the client-side because I thought the error was coming from a different method, but it makes more sense to me to handle it this way

[yasserfaraazkhan]

/update-branch

[yasserfaraazkhan]

@hmhealey
I'm seeign this error message This URL is taken or unavailable. Please try another. when I try to create a team with same url.

[MeHow25]

@yasserfaraazkhan Have you used the steps from the link below to reproduce this bug?

#26841 (comment)

1. Create User No. 1.
2. Create a team with the URL “/lorem” using that user, but do not invite anyone.
3. Create User No. 2.
4. As User No. 2, attempt to create a new team with the same URL “/lorem.”
5. An error message stating “Must call update for existing team” will be displayed.

[yasserfaraazkhan]

@MeHow25
thank you! the error message is showing up.

[MeHow25]

@hmhealey Hi, I see that the "Enterprise CI/tests" is failing, but I don't have access there. Should I fix something?

[hmhealey]

It's failing because en.json is out of order because of the new string you added, but since we missed it during reviews, I should be able to just fix it now.

Thanks again for the PR for this!

[mm-cloud-bot]

Test server destroyed

[mm-cloud-bot]

Test server destroyed