If it's buggy on both platforms it could be the connection but it may be something in the Realm or some corruption. Does this happen only in this Realm or every Realm? ^TK
We're gonna need to send you up to the accounts team to look into this! Please send us an email at aka.ms/Minecraft-Support and we will assist. Remember to attach your Transaction ID and account name / Gamertag. ^TK
This FAQ will provide all the information you need regarding the Vanilla Cape: help.minecraft.net/hc/en-us/… If you don't have the games on the same account you are not eligible for the cape. ^TK
No worries, our Account team can look into assisting you.. Please send us an email at aka.ms/Minecraft-Support and we will assist. Remember to attach your Transaction ID and account name / Gamertag. ^TK
Please visit our bug report site to see if the problem has already been reported: bugs.mojang.com. You can upvote if the issue hasn't been resolved. If you think you've found a new bug, visit our help site here on how to submit a report! aka.ms/MCBugTrackerHelp ^TK
Go ahead and give your Router a reset, uninstall/reinstall, and then finally check your firewall/antivirus for permissions. If that doesn't work I'll escalate you upward. ^TK
The cape can take a bit to show up in your account! If you still don't have it by next week you can reach out to us for a closer look: aka.ms/Minecraft-Support so we can quickly and safely assist with your question! ^TK
Let's go ahead and reset the router first and then try to join the World. If you're still unable from there it may be that your World is corrupted. ^TK
They won't be able to help unlink it but Microsoft could look at your account and do their best to assist you in this matter. nitter.vloup.ch/xboxsupport or support.xbox.com ^TK
You would need to purchase the game on the new platform. Though you may be able to reach out to Microsoft since it is a Windows phone to see if there is anything they can do. nitter.vloup.ch/xboxsupport or support.xbox.com Not 100% on if they can do anything though! ^TK
I'm not seeing any issues on our end that took place with Realms! Is it still going on at this time and can you tell me what troubleshooting steps you have tried? ^TK
I'm not sure if it's an older gen phone but I do know that my phone started to overheat with certain online games! Not a lot of troubleshooting I can do here but you can provide feedback to devs: feedback.minecraft.net/hc/en… ^TK
If the cape does not show up in your account you will need to reach out to our Support team and we'll assist you from there. To keep your information secure, please complete our request form at aka.ms/Minecraft-Support so we can quickly and safely assist with your question! ^Tk
Are you on PC by any chance? This sounds like it could be connection but my bet is the World may be corrupted and that's why you're seeing all of these issues. ^TK