Today, I got an error with ssh authontication not working.

I honestly have no idea and will look into it.

At first, I read

because this page was introduced with the error text.

I always make a key by RSA.

But after OpenSSH 8.8 released, RSA signatures using SHA-1 hash have been discounted.

I change type of key to ECDSA and SSH authontication was successful.