Login form security toke warning - even if login form page is exclude

Hi Vitja,
since using PCE some login form pages throws the following warning message:"Warnung Der Sicherheitstoken ist falsch. Die Anfrage wurde zurückgewiesen, um eine Sicherheitsverletzung zu verhindern. Bitte die Seite aktualisieren und erneut versuchen."The login form page is added to PCEs list of excluded URLs. No error message after disabling PCE. 
Some users use 2-factor authentication, therefore it could be connected to that, too.

Thanks for any hint.

Kind regards,
Bernhard

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