[BUG]: #1560778826: You are not authenticated to see this view

[agendartobias]

TYPO3 v12.4.15 luxletter v26.2.0 (same on v26.1.0)

I am adding a new newsletter, select a page and get this error instead of a preview:

Core: Exception handler (WEB): Uncaught TYPO3 Exception: #1560778826: You are not authenticated to see this view | In2code\Luxletter\Exception\AuthenticationFailedException thrown in file /var/www/html/typo3conf/ext/luxletter/Classes/Controller/FrontendController.php in line 76. Requested URL: https://mysite.si/enovice/preview.html?tx_luxletter_preview%5Blanguage%5D=0&tx_luxletter_preview%5Blayout%5D=NewsletterContainer&tx_luxletter_preview%5Borigin%5D=127

In Extension Configuration -> luxletter if i remove checkbox in Multilanguage mode and define URL by myself: https://mydomain.si/enovice?type=1562349004 preview works ok