For SharePoint on premises,
We had multiple customers preferring different authentication provider to connect to their sites. For eg: one customer was asking for their Azure AD authentication with SharePoitn and other for their ADFS authectication with SharePoitn,
We create webapplication for each custoemr and extended the webapplication where one webapplciation was federated with customer Azure Ad and other with Customers aDFs.
My question is How can we achieve the same in SharePoint online.