Acrobat Checkmarks don't show on other devices

I work at an advertising company.

We made the annual report for a customer recently and the customers commented on the PDF, explaining which parts of the report they wanted us to edit (text and images).

So yesterday, my boss told me to only change the text edits in InDesign and mark the relevant comments by clicking on the checkboxes and send it to him.

When I came into the office today, he asked me why I didn't mark the comments, which I had in fact done.

They just didn't show up on his mac. We all work with macs, so there's no transfer to another OS.

Now we're searching for the problem, but it seems like nobody ever communicated this on the internet.

It's quite important for the workflow that we can see the checkmarks on all devices. I'm looking forward to your responses.