How to write a link to open the application directly in direct with the user?

Question

Social media

How to write a link to open the application directly in direct with the user?

I managed to open the profile in this way - instagram://user?username=

But I don’t know the link in direct. I tried this - it doesn't work:
instagram://direct?username=USERNAME
instagram://message?username=USERNAME

Help me find the correct link if it exists.