I needed to change the definition of ReturnUrl in LoginViewModel to be nullable in order for the ModelState to be valid if a ReturnUrl wasn't supplied.
public string? ReturnUrl { get; set; }
Or you can remove < Nullable >enable</ Nullable > from the csproj file
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I needed to change the definition of ReturnUrl in LoginViewModel to be nullable in order for the ModelState to be valid if a ReturnUrl wasn't supplied.
Or you can remove
< Nullable >enable</ Nullable >
from the csproj file