Star Alliance miles from Air Canada flights
Starting this year I'm having issues getting United Mileage credits from Air Canada. I ONLY collect miles on United, with Silver status there. I do have an Aeroplan number, but never use it outside of the app. In March, I had flights to Vancouver. I didn't get the United credit. I filled out the form on United, and got the credit. In May I had flights through Montreal to Germany (Lufthansa). Lufthansa gave the credit for the long legs, AC didn't, I filled out the United form and they said the credit for Ottawa to Montreal was applied to Aeroplan. I assume this was because I checked in using the app. I was willing to ignore those, since they're tiny. Then a few weeks ago I flew to Lisbon, and back from Porto. I made sure not to check in using my AC account, or use in flight messaging tied to Aeroplan. One short leg back was on TAP (Portugal). They gave the credit for it on United within 2 days. I still have no credit from AC anywhere. My bookings show the United number.
I filled out an online form on AC asking for help but have no response. I'm trying to understand how to deal with this. I've flown on AC getting United miles for about 20 years always only using my United number, this seems to be a new problem, but it's happened on 3 straight trips. At this point I may miss out on keeping Silver status because of this.