Mail account setup fails with unknown error when using incorrect authentication

[gitaarik]

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Steps to reproduce

1. Set up a new mail account in the mail app
2. Use manual setup
3. Enter a incorrect password
4. Try to add the account

Expected behaviour

You see an error message saying that the authentication failed and that you should check your username and/or password. I saw in the developer console that the error was indeed about authentication:

Creating account failed: Could not connect to IMAP: Authentication failed.

Actual behaviour

You see an unclear error message: "Unexpected error during account creation"

Server configuration

Operating system: Ubuntu

Web server: nginx

Database: MySQL

PHP version: 7.2.24

Nextcloud version: 18.0.4

Updated from an older Nextcloud/ownCloud or fresh install: Fresh install

Where did you install Nextcloud from: Nextcloud website

Signing status:
No errors have been found.

List of activated apps:
Enabled:

• accessibility: 1.4.0
• activity: 2.11.0
• bruteforcesettings: 1.6.0
• calendar: 2.0.3
• cloud_federation_api: 1.1.0
• comments: 1.8.0
• contacts: 3.3.0
• dav: 1.14.0
• federatedfilesharing: 1.8.0
• federation: 1.8.0
• files: 1.13.1
• files_pdfviewer: 1.7.0
• files_rightclick: 0.15.2
• files_sharing: 1.10.1
• files_trashbin: 1.8.0
• files_versions: 1.11.0
• files_videoplayer: 1.7.0
• firstrunwizard: 2.7.0
• logreader: 2.3.0
• lookup_server_connector: 1.6.0
• mail: 1.3.5
• nextcloud_announcements: 1.7.0
• notifications: 2.6.0
• oauth2: 1.6.0
• onlyoffice: 4.1.4
• password_policy: 1.8.0
• photos: 1.0.0
• privacy: 1.2.0
• provisioning_api: 1.8.0
• recommendations: 0.6.0
• serverinfo: 1.8.0
• settings: 1.0.0
• sharebymail: 1.8.0
• support: 1.1.0
• survey_client: 1.6.0
• systemtags: 1.8.0
• text: 2.0.0
• theming: 1.9.0
• twofactor_backupcodes: 1.7.0
• updatenotification: 1.8.0
• viewer: 1.2.0
• workflowengine: 2.0.0
  Disabled:
• admin_audit
• encryption
• files_external
• spreed
• user_ldap

Nextcloud configuration:
{
"system": {
"instanceid": "REMOVED SENSITIVE VALUE",
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"cloud.vedantawiki.org"
],
"datadirectory": "REMOVED SENSITIVE VALUE",
"dbtype": "mysql",
"version": "18.0.4.2",
"overwrite.cli.url": "https://cloud.vedantawiki.org",
"dbname": "REMOVED SENSITIVE VALUE",
"dbhost": "REMOVED SENSITIVE VALUE",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"installed": true,
"memcache.local": "\OC\Memcache\APCu"
}
}

Are you using external storage, if yes which one: /mnt/nextcloud/data/

Are you using encryption: yes

Are you using an external user-backend, if yes which one: No

Client configuration

Browser: Firefox

Operating system: Ubuntu

[ChristophWurst]

I'd say this is a duplicate of #3006