@MojangSupport レルムの招待人数は無制限ですか？

Unfortunately, not infinite, but the number depends. Java Edition Realms can support you + 10 players, and for Bedrock that can be 2 or 10 depending on subscription level! For more information and a comparison of plans, check out bit.ly/3SJTL1Z ^AM

それは同時接続人数ですよね。そうではなくて招待人数です。