I had a similar problem with my British Airways Chase card a couple of years ago. I temporarily moved my BA Executive Club address to Europe, at which point Chase informed me that I could keep the BA Visa card, but no Avios would be credited to my BAEC account until I changed its address back to a US location.

I changed my BAEC address back to the US a year or so later, however after a few months I noticed that the Avios I had been earning through my BA Chase purchases were still not being credited to my BAEC account. So I called Chase, and they told me that that was due to a discrepancy between my BAEC address and the address for my BA Chase card. Apparently if the two are not identical the Avios won't be automatically transferred. The lady I spoke to quickly fixed it, and the Avios started getting credited to my BAEC account from the following monthly statement. I haven't had any problems since then.

As regards the missing Avios for the five months prior to my phone call to Chase that fixed the issue, I e-mailed BAEC with a detailed list of the missing Avios by month, and six weeks later a BAEC customer service rep e-mailed me back to inform me that she had added them manually to my account. So the way to go is probably to call Chase first so they can fix the problem (likely a discrepancy between your addresses or your names for Iberia and Chase), then to e-mail IB's customer service with a request to credit the missing Avios, and that is likely to take weeks, if my experience with BA is any indication.