I am trying to access realms and I keep getting an error message that I can't log into a microsoft account. It says I'm using a child account, but I am not. I have all content set to unrestricted as well. Please help me fix this issue.

Does MCPE-29304 describe your issue?

Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki