[Bug]: authtoken.ts does not throw or show error in addToken function

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

In apps/settings/src/store/authtoken.ts the addToken function does not throw an error to be used by apps/settings/src/components/AuthTokenSetup.vue the catch section of the code is basically deed code, as the function catches any error and returns null, which is not handled by AuthTokenSetup.vue, it tries to catch an error which is never thrown, and it does not show the error unlike the other functions in the authtoken.ts file.

Steps to reproduce

1. Block the '/settings/personal/authtokens' endpoint in the browser, or disable it the server.
2. Try to create a new device token, an error is never shown.

Expected behavior

Show an error for the user

Nextcloud Server version

35 (master)

Operating system

RHEL/CentOS

PHP engine version

PHP 8.5

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start with apps/settings/src/store/authtoken.ts and inspect the addToken error path, then compare how the other functions in that file report failures. Read apps/settings/src/components/AuthTokenSetup.vue to follow its catch handling and reproduce the issue by blocking the /settings/personal/authtokens endpoint. Done means token creation failures result in an error being shown to the user.