Trying to file a claim with British Airways

Hey all, so with the new Travel Ban from Europe I have to expect that it'll get extended past the initial time frame and when I visit Europe I won't be back.

So background: I purchased my tickets through Hopper and they are through British Airways. In order to initiate a refund with BA I need an IATA number that I assume is assigned to Hopper but I can't find any information regarding it.

Does any one know where I can find or what it is?

Also no I did not purchase travel insurance, I'm going to file a claim with my Credit Card company, but in order to do that I need to file a claim with the airline first.

I also purchased the tickets previous to BAs current "generous" refund policy.