Cannot Scan Sanctuary Targets - PC Bugs - Warframe Forums
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Niko's Guide To Synthesis And Being The Ultimate Sanctuary Hunter - Players helping Players - Warframe Forums
Warframe: How to Use the Synthesis Scanner | How to Synthesize 3 Elite Arid Lancers(The New Strange) - YouTube
TIL you actually can track synthesis targets with the scanner. These simaris wisps make a trail that lead right to the target but you can only see them with the scanner. :
Steam Community :: Guide :: Synthesis Target Locations [31.0.5]