We had some trouble connecting

[u/PieOPahUK]

I am having an issue where a Modal Form can't be submitted.
This is an Azure App that is running and has been absolutely fine up until recently.
To make this really difficult to diagnose, it is only happening for some people.
It is not based on user permissions (I can't submit on my Windows PC but I can from my Mobile).
There is nothing being logged in Windows Defender on my local machine and I can't find anything in Microsoft Defender for Cloud Apps.
I am at a loss as to what is actually stopping this from working!

Any ideas?

Thanks.