My Kinsta hosting engineer asked me to ask you this question:
Since we use Nginx on Kinsta, .htaccess rules do not work here and can also not be implemented to work here at this point. We understand that the rule
SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
is trying to pass a header for HTTP Authorization. We would translate it to this Nginx header after having seen a similar case on the web:
Can you verify this is what is needed?
Please inform and I will forward your answer to my hosting engineer. Thank you.