I setup the IFTTT connection to my Monzo US account about 2 months ago and it never worked. I hooked it to the YNAB API so that when I swiped my card it would push that to YNAB. Never worked for some reason. Yesterday out of the blue it worked when I bought groceries, and it brought 7 other transactions with it. I have no idea if this was something done on Monzo US’s side, or IFTTT, but I’m thankful it’s working finally!