I made an Iberia booking through Expedia for travel that includes long-haul sectors on BA. Iberia and BA share the same booking reference. On the app, I can't access the booking either when logged into my BAEC account, or when logged out. On the desktop, I can access it only when logged out.

Is there any workaround that will allow me to access this booking and check in, etc. on my smartphone and specifically on the BA app?

Thanks.