No People found

I have the same exact issue as stated by jean-jacques.  I am pasting the system info below: 

Lightroom Classic version: 15.3 [ 202604090947-8f3672ed ]
License: Creative Cloud
Language setting: en-US
Operating system: Mac OS 26
Version: 26.4.1 [25E253]
Application architecture: x64
Logical processor count: 16
Processor speed: 3.8GHz
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.213

Built-in memory: 32,768.0 MB
Dedicated GPU memory used by Lightroom: 4,533.1MB / 8,176.0MB (55%)
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 8,254.4 MB (25.1%)
Virtual memory used by Lightroom: 108,395.0 MB
Memory cache size: 7,660.6MB
Internal Camera Raw version: 18.3 [ 2527 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 1602MB / 16383MB (9%)
Camera Raw real memory: 1715MB / 32768MB (5%)

Cache1: 
Final1- RAM:352.0MB, VRAM:0.0MB, 8K3A5742.CR3
Final2- RAM:352.0MB, VRAM:30.0MB, 8K3A5741.CR3
Final3- RAM:976.0MB, VRAM:2,601.0MB, 8K3A5742-Edit.tif
NT- RAM:1,680.0MB, VRAM:2,631.0MB, Combined:4,311.0MB

Cache2: 
m:7,660.6MB, n:957.0MB

U-main: 116.0MB

Standard Preview Size: 5120 pixels
Displays: 1) 5120x2880, 2) 2560x1440

Graphics Processor Info: 
Metal: AMD Radeon Pro 5500 XT
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_7)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/Seagate/Lightroom_Catalog/2026/May 2026/May 2026.lrcat
Settings Folder: /Users/klouddata/Library/Application Support/Adobe/Lightroom

Installed Plugins: 
1) AdobeStock
2) Aperture/iPhoto Importer Plug-in
3) Flickr
4) Topaz Photo (Studio)

Config.lua flags: 

I am using iMac and had installed the OS freshly along with fresh download and install of LrC.  It is really frustrating not to be able to do a mask for people as I am not able to edit skin, hair, clothing etc individually anymore.

I am having the same problem.  It's not consistent.  The majority of the time it works fine but I have specific photoshoots where the talent is obviously visible and isolated filling the frame and LRC doesn't find "people" in any of the photos.  I'm running the Apple M2 Max w/32g memory.  It's super frustrating because it completely ruins my portrait workflow (1st world problems, I know).  I've developed a masking workflow based on the "find people" feature so when it doesn't work my delivery to client is delayed serveral days if not weeks when I have to touch up manually.  There is no solution for my issue on the web that I've found.

Please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.