Hi @MatheusRibeiro,
@LesionX , @CasRomeoJC2014 , tag you guys to join this discussion.
I have tested on my side by a new version, and it appears in my list:

Also, check to see if your administrators have used DLP policies in the Power Platform admin center to disable most of your connectors.
If your administrator have blocked it, you could not have access to this connector.
Also, try to delete the onedrive connector and search for excel online one more time.
To be honest, if this file is available on OneDrive, I will suggest you connect to it using OneDrive.
If above could not solve your problem, I think you need to open a ticket to investigate it deeper, here is our support team, please contact them:
Support | Microsoft Power Apps
Good luck.