Unable to set up a mail autodiscover profile on iOS for a mailbox in Plesk: Invalid profile

Symptoms

• In Domains > example.com > Mail Accounts > "info" button near mailbox > iOS Mail on iPhone or iPad tab while opening generated link (e.g.: https://example.com/email.mobileconfig?emailaddress=user@example.com) on an iOS device there is an error:

  CONFIG_TEXT: <Invalid Profile>
  Safari could not install a profile due to an unknown error

• The following error appears on an attempt to `curl` the configured mailbox above:

  CONFIG_TEXT: {"type":"Zend_Exception","message":"No entry is registered for key 'container'","file":"Registry.php","line":147,"stackTrace":null,"codeFragment":null}

• In the C:\Program Files (x86)\Plesk\admin\logs\php_error.log file there is the following error:

  CONFIG_TEXT: ERR [panel] No entry is registered for key 'container':
  0: C:\Program Files (x86)\Plesk\admin\plib\vendor\plesk\zf1\library\Zend\Registry.php:147
  Zend_Registry::get(string 'container')

Cause

Product issue:

• #PPPM-13390 "Trying to set up mail autodiscover in the iOS Mail app on iPhone or iPad via the Plesk-generated link or QR code no longer fails with the “Invalid Profile” error."
  Fixed in:
  • Plesk Obsidian 28 February 2022

Resolution

Please consider updating your server:

• How to install Plesk updates

Workaround

If an update is not possible for some reason you may try the following: