Since OA 7.1 login to Control Panel can fail if user's password contains national symbols (like 'ä'). The following message is shown:
"You do not have the necessary permissions. Please contact your account administrator for assistance."
Odin Operations Automation does not support passwords containing symbols of national alphabets. Such passwords can be set through OA Billing if "Password Quality Level" parameter is set to "None".
This behaviour is confirmed as an internal software issue with ID #PBA-82032. Contact your Technical Account Manager or Pooled Technical Associate Team at firstname.lastname@example.org to clarify the status of #PBA-82032.
Change user's password to the one containing Latin letters (uppercase and lowercase), numerals and symbols (all characters not defined as letters or numerals) except spaces.
There are other cases not related to user's password where login to Control Panel can fails with the aforementioned error message: