HTC’s Mo Versi posted the news on the delay via his Twitter account:
HTC One M8 & M9 AT&T owners – there’s been a slight delay on M OS. We’re in lab but looking at approval within the next couple weeks.
— Mo Versi (@moversi) April 29, 2016
The Marshmallow updates for the HTC One M9 have already rolled out for Sprint, Verizon and T-Mobile owners.
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John Callaham #AndroidCentral #Android #News #Google #Alphabet http://www.androidcentral.com/marshmallow-updates-att-htc-m8-and-m9-get-delayed