Good day. Currently I am having issue with loading dataverse table data to model-driven app page. I have system admin role but it is showing to contact with system admin for the access.
If its a custom table, then go to the roles you think you have and make sure that Table is included. That are you are NOT a sysadmin, or you are NOT logged in as the system admin in that window
Also you said system admin, do you mean for THAT environment or all up in your tenant. Make sure you are added to whatever environment you cannot see the data in and make sure the custom table doesnt have blocks on it (which it might) for people to see it. This would also block admins.