I am not an expert in this field, but with a bit more info, I am sure
someone will be able to help you.

In what version  of Excel did you develop your VBA code?

List the Excel versions  on the five computers, including which ones work
or not.

Did you have to include another dll in VBE while developing the code to
access the browser? If so, was this activated on the other PC's?

Windows version per computer, again which ones are working or not.

Any other special software, e.g. custom firewalls, or user access rights
on the internet?