I want to upload an AASA (apple-app-site-association).
The problem I'm having is that I can't set the MIME-Type. I placed the file in the root / and the .well-known folder without an extension. After that I tried (like I did with success on an other hosting provider) to change the MIME-Type to application/json.

This is my .htaccess file:

RewriteEngine On

# BEGIN Thunermay (Admin)
# set apple-app-site-association as application/json for Apple's crawler
<Files "apple-app-site-association">
    ForceType 'application/json'
</Files>
# END Thunermay

When I used an AASA validator (this and this one), I can't get the right content-type. The second one shows me at least that the file is parsed but without a content-type:

No Redirect:              Pass
Content-type:             [] 
JSON Validation:          Pass
JSON Schema:              Pass

I don't know where my mistake in the .htaccess is nor do I know how to potentially debug the .htaccess

Thanks for help in advance!