I was trying to test the Custom Actions feature and at first everything was OK, we had even one test action uploaded to PowerPlatform some time ago.
However for new projects (I even tried just to copy the examples: #1 and #2) PAD now throws error that I cannot find anywhere.
I already tried different scripts for signing (from official examples above as well) and nothing helps.
It seems to be not a signing issue because other message would appear in this case.
Error message: No custom actions group was found. Please check the naming and development conventions are followed correctly and try again.
It will be very much appreciated if I could get some help in this regard, maybe someone already faced this issue and was able to solve it.
Error screenshot:

Code is quite simple:
Spoiler (Highlight to read)
using System.ComponentModel;
using Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK;
using Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.Attributes;
namespace Modules.MyCustomModule
{
[Action(Id = "CustomAction", Category = "Custom cat")]
public class CustomAction : ActionBase
{
[InputArgument, DefaultValue("Developer")]
public string InputName { get; set; }
[OutputArgument]
public string DisplayedMessage { get; set; }
public override void Execute(ActionContext context)
{
DisplayedMessage = $"Hello, {InputName}";
}
}
}
using System.ComponentModel;using Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK;using Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.Attributes;namespace Modules.MyCustomModule{[Action(Id = "CustomAction", Category = "Custom cat")]public class CustomAction : ActionBase{[InputArgument, DefaultValue("Developer")]public string InputName { get; set; }[OutputArgument]public string DisplayedMessage { get; set; }public override void Execute(ActionContext context){DisplayedMessage = $"Hello, {InputName}";}}}