Hey, I get asked this a lot, "My relic doesn't load from my artifact weapon." I can fix that for you!
TLDR: Go in game and open your artifact weapon as if you were going to spend a point or place a relic in it. That will allow the addon to see what's in your artifact weapon. Then get a new export string and use that one
Background: The game doesn't let addons 'see' the points or relics you put in your weapon by just having it equipped. But once you open it, the addon can read it (so make sure the AMR addon is installed and enabled. It doesn't have to be open, however).