Defender unable to add htaccess to Prevent Information Disclosure

I have many donamins on server and I've been able to apply this fix to all other domains so far.

And I've been allowed to do ALL other suggestions, it's just this one that hangs.

I click and it waits and just comes back up without an error message or anything to give an idea what why it was unable to do it.

Support access have been granted, in case you wish to take a look.