For each of you nuget packages you must pick the .netstandard or .net core version. If there not one, you will need to replace the package. all you reference projects must be .netstandard or .net core.
In your case you need a replacement for Microsoft.AspNet.Identity.EntityFramework nuget package because it does not support .net core. Asp.net core has one you can use instead.
if you want to use a current database you will need to migrate passwords. See this article for hints
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Re: Issue in treansferring code from old project.
Oct 28, 2020 02:53 PM|bruce (sqlwork.com)|LINK
For each of you nuget packages you must pick the .netstandard or .net core version. If there not one, you will need to replace the package. all you reference projects must be .netstandard or .net core.
In your case you need a replacement for Microsoft.AspNet.Identity.EntityFramework nuget package because it does not support .net core. Asp.net core has one you can use instead.
if you want to use a current database you will need to migrate passwords. See this article for hints
https://andrewlock.net/migrating-passwords-in-asp-net-core-identity-with-a-custom-passwordhasher/