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@macaroon
The new Shimano mechs need quite a bit of cable tension to get them to shift properly. You'll need an inline barrel adjuster if there isn't one on the frame, unless you use the allen key trick.
Easiest thing to do is disconnect the cable and just push the mech across by hand to see if it moves over to the big ring.
Another thing to check is you've clamped the cable in the correct position at the mech.