If you get this error when trying to SSH to a device or machine and you never even got a password prompt:
Too many authentication failures
This means that either the remote side is configured for key auth only, OR your client side may be attempting to auth using mulitple keys, and that exceeds the amount of attempted authorizations on the remote ssh server.
If the issue is trying to auth too many times which ssh defaults to sending the keys to, you can set a preference when connecting that prefers password auth first:
ssh -o PreferredAuthentications=password user@remotehost
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