Login Not Found Error but it Does exist

hi experts,
This is a new instance. I saw login failures in the logs so I created the login, even granted the sysadmin role temporarily. But the login failures are still occurring "Could not find a login matching the name provided"
(The login is Domain\ServerName$)
How can I find which host or app is trying to use this login?
Thanks

run a trace and capture those details

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