If you get this error in Minecraft Failed to login We could not sign you into your Microsoft Account. Access to Realms, Profiles, and your Store items will
be limited. Please try again later. Error Code: Creeper
This tutorial will guide you on how to resolve this issue
This error occurs when the game services can’t connect to Xbox servers for game settings and multiplayer features. This can occur due to a faulty or inconsistent internet connection.
Restart your device & Router
Turn off your router and modem, wait 20 seconds for power to cycle off, and restart your device.
Unlinking and relinking your Microsoft account in Minecraft may fix the issue
https://help.minecraft.net/hc/en-us/articles/30688562181005-Creeper-Error-Code-Troubleshooting-in-Minecraft
Close other programs and devices
If there are any other devices or programs accessing your Wi-Fi network, close unnecessary programs and disconnect other devices from your network.
https://help.minecraft.net/hc/en-us/articles/30437628422413-Troubleshoot-Minecraft-Network-Connection-Errors