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I could compare it to this question about whether the Devil's Sight invocation allows one to see into Hunger of Hadar, but that question has an easy answer, due to the 'blinded' condition it affects the person inside with. However, the spell Mordenkainen's Private Sanctum does not give the 'blinded' effect- it merely states that, in one of its properties:

The barrier of the warded area appears dark and foggy, preventing vision (including darkvision) through it.

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It does prevent Devil's Sight

As seen in the PHB list of spells:

Devil's Sight. You can see normally in darkness, both magical and nonmagical, to a distance of 120 feet.

Private Sanctum. The barrier of the warded area appears dark and foggy, preventing vision (including darkvision) through it.

And having the creative intention behind Devil's Sight explained by Jeremy Crawford:

Jeremy Crawford on Twitter. Devil's Sight is meant to pierce the dark created by a spell like darkness, not the void of hunger of Hadar.

Private sanctum seems to not create magical darkness, but make the area on the inside look dark and foggy when looking from the outside. So even if Devil's Sight would pierce the darkness(Which I don't believe it does in this case) it still cannot pierce the fog.

Thank you Slagmoth for pointing out my mistake.

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  • \$\begingroup\$ Please cite your sources for quotations. Also note that while JC's tweet is interesting and can be some additional support, it is not official in any way. \$\endgroup\$ – NautArch Dec 4 '19 at 16:30
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    \$\begingroup\$ If it is foggy how can Devil's Sight penetrate the obscurity? I think their wording is poor but only the darkness part of that ward is ignored by Devil's Sight. \$\endgroup\$ – Slagmoth Dec 4 '19 at 17:28
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    \$\begingroup\$ Now that meantion it, it does say foggy. That word really does complicate the situation. I'll rethink the answer \$\endgroup\$ – Bruno Souza Dec 4 '19 at 17:38

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