VST3 not Scanning

I’ve made a VST3 plugin, it runs fine one the windows pc i build it on, but when I sent to people to test they get the message in Reaper it doesn’t scan. What’s a common reason for this ? Can I link the vst3 here ?

Originally I delevoped it on Mac, that works fine, so I pushed to git, cloned the git on my windows pc and did the build there again with visual studio as the exporter.

Can you load it in pluginval? Did you statically link Visual C++ Redistributable Runtime and all other libaries?

pluginval says all tests passed .I’ll try another version with the runtime set to static in projucer. Could it also be a rights problem ? does he need to set the the .VST3 to read and execute ?