Unable to backup data on my new iPhone

Hello! I recently switched to IOS and now im trying to Backup my data. And the real problem is that it tells me that i do not have enough storage in my ICloud but ive only used 7,6MB out of the 5GB. I tried everything like restarting, sighing out…If someone can help me ill be very thankful cuz i do not know whats going on.

[Re-Titled by Moderator]