Pre-Pandemic time, I had first flight on QR but QR did not want to (or was not able to) ticket. I always (on two separate DONEx) called AA and AA ticketed them with ease. Later, when I had to make changes, I called AA to get them done. Never a problem.
I am NOT conversant with the new rules or any updates there off (since Dec 2019), but it looks like you exited Europe (HEL-LPA) and then returned to Europe (EUN-BCN). That might be a red flag. I don't know if LPA, EUN are considered as being the ME. Others might chime in to help.