Unable to connect to the authentication service problem.

Hello. I keep getting the 'Unable to connect to the authentication service. Check the server status here. If it looks good, follow the guide here. ' problem.

The thing is, the error I'm getting only happens on a few accounts that I got.

My main works just fine, but some other accounts keep getting this error.

I tried Flushing the DNS, I watched and done the 'Configuring your DNS' guide.

Still deosn't work.

The account I'm trying to connect is an older one (2018) if that helps.

I also used the Hextech repair tool.

Here is the video: https://youtu.be/sVP2pqpRwuY

Also, this is a repost as I wrote another one like 4 days ago and nobody hasn't answered yet.