Sign in with a domain account that has administrator permissions to this device
Select the Start button.
On the Users tab, under Users for this computer, select the user account name, and then select Reset Password.
Type the new password, confirm the new password, and then select OK.
Regards,
Rachel Gomez
Try removing Mac Informer and installing it back again. This should wipe the erroneous login data and allow you to use the correct credentials.
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