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Hi @CarolLai-5934, please have a look at this known issue link. There are few workarounds suggested in the thread, please see if those are helpful to you.
Refer to the answers in this thread too.

Note that AzureAD.UI and AzureADB2C.UI APIs and packages are marked obsolete. Ref here.
Starting in .NET 5.0 integration with AzureAD and AzureAD B2C authentication will be provided by Microsoft.Identity.Web which is based on Microsoft Identity Platform (formerly known as AzureAD v2.0 endpoint).


@darotta , please let me know if the answer was useful.