Hey @Paulina_Segovia I just figured out my issue and I hope it helps you with yours.
if you downgrade your version of mongosh to 1.6.2, you will be able to connect. For some reason the latest version of mongosh gives the error. After downgrading, I was able to connect no problem.
brew uninstall mongodb-community
brew uninstall mongosh
wget https://raw.githubusercontent.com/Homebrew/homebrew-core/4519776bc4563548dcd8c8639ac7e073b107c381/Formula/mongosh.rb
brew install ./mongosh.rb