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Came up in a game today. If there are units at the beginning of the turn out of synapse, but a trygon prime deep strikes in range and provides synapse, do the units that were out of synapse range before the deep strike sti test for instinctive behavior?

We played it that the deep strike happened first, at the beginning of the player turn, but before the beginning of the movement phase, which is when you check for synapse. Did we play it right?

it depends, i believe that coming in from reserves happens before or at the same time (beginning of the Movement Phase) as would the Instinctive Behavior test.

So the player, whose turn it is, can choose which happens first, and so if the Trygon placement results in the nearby units being in Synapse range then they should be OK.

I am not 100% on this though.

I believe the above is correct. However, if the units out and then you MOVE synapse into range they must check first.

Q: Blessings are manifested ‘at the start of the Psyker’s Movement phase’ does this mean they happen simultaneously with Reserves rolls, Outflanking rolls etc and if so which is resolved first?
A:They do occur simultaneously - as such, the player whose turn it is decides in what order these things occur as per page 9 of the Warhammer 40,000 rulebook.

You are looking at the same situation here, so use the same section of page 9 to support it. You, as the player whose turn it is, decides which order these events occur as they are simultaneous. If they ask for something more then that section of the book, point to the FAQ on the official website where that question outlines a similar, not exact, situation and states to view page 9.

Tyranid FAQ:

Q: Do units who begin their turn more than 12" from any Synapse
Creature have to test for Instinctive Behaviour if a Synapse Creature
arrives from reserve within 12" at the beginning of the Movement
phase? (p33)
A: Yes – the model has begun its Movement phase outside of
synapse range.