Adding below code in Blazor server apps Program.cs helped solve the issue:

builder.Services.Configure<HubOptions>(options =>
{
    options.MaximumReceiveMessageSize = 10 * 1024 * 1024; // 10MB or use null
});

More information can be found on:

https://www.telerik.com/blazor-ui/documentation/knowledge-base/common-increase-signalr-max-message-size

Also the code below was already added and it didn't help:

builder.Services.AddServerSideBlazor()
    .AddHubOptions(options =>
    {
        options.MaximumReceiveMessageSize = 100 * 1024 * 1024;
    });