Connection Errors to Minecraft Realm

I am unable to connect to my Minecraft realm on my home network. This is what I've observed:

• I can play using my phone's hotspot 
• It boots me saying "forcibly disconnected by remote host"
• I was using my hotspot and entered the end, then later disconnected my hotspot because I ran out of data (which is a huge issue) and I was able to move and play while in the end. So the realm works when I'm in the end but it doesn't work anywhere else
• Can still play on legitimate servers

Summary: 

Realms only work when I'm in The End for some reason

What I've done to try to fix the issue.

• Delete and redownload both Minecraft and Java
• Allow Java to use 'native sandbox'
• Make sure Java is enabled in the firewall
• disable my firewall to see if that was the issue at all.