Need recommendations for a safe community platform for teens.

I am building a community of teens to foster collective growth from shared learnings. We are currently on the https://www.mightynetworks.com/
platform but their onboarding seems complicated for my audience. Are there better options?

Some context:
My audience is teens from cities in India who are familiar with the English language. Slack and Discord seemed too complicated for them. So, we chose MN because they had a simple UI and also have a mobile app that stood out for us since these teens are mobile-first users.

However, they found MN's onboarding complicated as well. You need to enter your phone number to get a link to the app that can be downloaded and then you need to search for a community and join. What seemed easy to us didn't seem quite as easy to the teens.

MN also does not have social media integrations.