Possible reasons:
1. An invalid password or customer ID has been entered
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E.g. by inserting the password via copy & paste
(Special characters can possibly get copied with the password)
2. Too many failed login attempts
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Wait for the end of the displayed lock period and try again
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Use the „Lost password?“ function to have a new password created after the lock period has been suspended
3. Your account is deactivated (locked)
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Please contact our support in writing under support@euserv.com