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In rec.aviation.owning Dave Stadt wrote:

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Only a FAA or a DUATS briefing counts.

Where is that documented?

Which part? That you need a briefing, that it has to be "official" or
that FS and DUATS are the only briefings that count?

91.103 says you need a briefing and contains the catch all of "all
available information concerning that flight" which to the FAA enforcers
means weather, NOTAMs, TFRs, etc.

That's not what 91.103 says.

AIM 5-1-1 says FS or DUATS.

It suggests FSS or DUATS.

There was a proposed AC to add other services; I don't know if it was
approved.

I have seen FAA statements to that effect but only for part 91 flights.