Originally Posted by MichaelA380

That is the wildest interpretation I could have ever imagined ... apologies for asking, but I am wondering how could you physically stay in two rooms at the same time?
As the T&Cs say, the welcome amenity can be used by you and one person registered and staying in the same room as you.
The welcome amenity cannot be used by anyone registered and staying in the second, third, etc. room - irrespective that these may have been booked under your IHG 1R account (in the same way as a complimentary upgrade could be awarded to the room you are personally registered and staying in but to none of the others).

Originally Posted by HadesNL

I have to agree with MichaelA380 on this one:

Diamond elite's welcome amenity breakfast will only be offered/registered
to the room for which the Diamond elite member ( + 1 extra person if double occupancy room)
has booked AND is physically present/staying/occupying in own person that said booked room

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OT:
The only program that offers perks for other rooms that you are NOT occupying in person is
WOH Hyatt for Globalist status : guest of honor https://onemileatatime.com/guides/hyatt-guest-of-honor/
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https://onemileatatime.com/guides/hyatt-guest-of-honor/