With Office 365 Excel Online, Edge iPadoS 17.1.1, how to reference this from other Workbook?

I need help to reference separate Workbook using Office 365 Excel Online on ipadOS 17.1.1.

Following steps worked for Windows desktop but not in with Office 365 Excel Online.

1. open two instances of Edge 
2. login Office 365 for step 1
3. Open a workbook A in instance 1
4. Open a workbook B in instance 2
5. In cell of Workbook A, type in equal Sign
6. Then click on Workbook B cell