Hello @detlef-knop,
My name is Henry and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
Before proceeding, I can only speak in English so I will continue to reply in this language.I am sorry about the issues you are having with your account. This issue is normally caused by the in-built password manager of the browser you are using. Please check if your browser stored a password for lastpass.com and delete it. Once you have deleted all passwords for lastpass in your browser you should no longer have this issue.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry | Customer Care
Hello Henry
😀 Danke für die Hilfe mein Problem ist gelöst.