Because the developers haven't added support yet.

On September 23, 2015 12:50:08 AM EDT, Nadir Husain <[email protected]> 
wrote:
>@seth @richard why is oauth2 not supported? most other clients support
>it. takes away from an otherwise superb app 
>
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-- 
Seth H Holmes
Sent from my Nexus 7 with K-9 Mail. Please excuse my brevity.

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