Unable to Upload Data Source

I deleted a data source, and tried to upload a new Google sheet, but I’m getting an error
“Failed to create data source. Please try again and contact support if the problem persists”.

I’ve confirmed sharing is active for the sheet, deleted the original sheet from my account, copied and renamed the sheet, cleared my browser cache, and logged out of both Thunkable and Google but I’m still getting the error. I just started the app buld so I haven’t built anything that accessed the sheet I deleted.

What am I missing?

Update to my original post.

I just tried to add another google sheet and was successful, but that sheet is missing column headings. I rechecked the sheet I’m trying to upload and it meets all the requirements