Александр

builder.Services.AddCors();

var app = builder.Build();

//Set Cors Policy
app.UseCors(c => c.AllowAnyHeader());
app.UseCors(c => c.AllowAnyOrigin());
app.UseCors(c => c.AllowAnyMethod());
app.UseCors(c => c.WithOrigins("https://localhost:44421"));