Unfortunately, cause this rule below we can't tell thank you for sharing their research to most people using researchgate.net !!!

"At ResearchGate, we’re constantly working to ensure that interactions between our members remain professional and useful. As part of this effort, we’ve made a change to our messaging feature: from now on, ResearchGate members can only send messages to people who follow them. This change is designed to help you connect with people you know and those interested in your work while also protecting your privacy and reducing unwanted messages.

We hope this change has a positive impact on your experience on ResearchGate.

Thanks for your understanding!"

I don't understand !!!

We need to do something !!!

With best regards !!!

Oskar