Cannot Add New Table using Smartsheet

I need to add new table from Smartsheet, but I am unable to.

I clicked on Add New Table, it said No available team data source. Please ask your team admin to add new team data sources. And I add new data source, it bring me to smartsheet page and I click allow, that it is. It goes back to Appsheet without adding anything, it also does not give me an option of adding which sheet on Smartsheet.

I checked the user, I am the admin, I also login through Smartsheet. And the data that we currently use are also from Smartsheet but I just want to add new Smartsheet. The app is not mine though, I am just Co-Authored Apps, but it should not prevent me on adding the table, since I am the admin.

Please advise.

Thank you.