SignalR Core 2.2 CORS AllowAnyOrigin() breaking change

There is a workaround, change AllowAnyOrigin to SetIsOriginAllowed:

app.UseCors(builder => builder
                .AllowAnyHeader()
                .AllowAnyMethod()
                .SetIsOriginAllowed(_ => true)
                .AllowCredentials()
            );

I have found a solution. You can try the following code part:

.SetIsOriginAllowed (_ => true)

This worked for me.