Fonts not working on Windows PCs

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I’ve just updated a seven-year-old F1 site with new design in F6. New fonts, self-hosted on their own server, managed by Web Font Pro in Site Styles. TTF, Wolf and Woff2 , Regular, Bold and Cond. (I’ve done this for years and every detail is correct to save you time asking.)

It wasn’t until I had a Teams online meeting with them and they shared their browser screen that it was clear that the fallback sans-serif was showing. All one weight - no bold or cond. Probably Arial.

This is on Windows Safari and Firefox. All my testing on multiple browsers - Mac Studio, iPhone, iPad - show the fonts as intended.

Bizarrely, despite this they are very happy with their new site design - but I was straight back to check my settings and server permissions. All are OK.

I can’t see that their server is blocking the fonts loading as they sit inside their own url and fonts folder permissions are OK.

Any clues as to the cause?

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Could it be very cautious Windows security settings?

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Thanks so much Paul, this Windows policy would explain everything.

It’s beyond credibility that their “feature” applies to professional fonts hosted on their own website . There are no font API calls from an external servers - I purposely make sure that these are kept to the bare minimum.

As it happens, I have a similar problem with “required” form fields not being sent - but only from Windoze PCs. I was going to post here but you’ve given me an avenue to explore, I’ll report back.

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I know this is a very old post but is it possibly a mismatch between URLs of the fonts and the domain? I know I’ve accidentally had one with www and one without. It didn’t cause a problem on Macs but did on Windows.