Cannot join Minecraft Realm despite concurrent membership

I have joined my friend's minecraft realm and it tells me that I am a member of said realm. Not only do I recognize that I am a member of this realm, but it also says I am a member on their end as well. Whenever I try to access the realm, I get to the loading screen for a few seconds, only to have a screen that displays, "You are unable to access this realm." Given that I am already a member of the realm, yet have errors which say the opposite show that I am experiencing a very unusual error. Could you please fix this? Thank you.