Xbox Exec confirms 1 million for Rise of the Tomb Raider = sold through to consumers.

[Natsu]

Hiku said:

Very interesting. That means Tomb Raider hasn't sold as bad as November numbers would have lead us to believe.

The first Tomb Raider sold 3.4 million units in its first month. Roughly 1,36 million on Xbox consoles.
Now they're saying it sold over 1 million on Xbox consoles in about 2 months.

Perhaps it took almost two months instead of one, but those aren't bad numbers at all. Especially considering the games it launched next to.

Most likely because it launched on the day fallout 4 released