HTTP ERROR 403 in AP Build Apps design-time

Hi experts,

I was working in Build apps normally, however, when I try to open the design page of my apps today, the browser shows me the following error:

I gussed that it is a problem of Identity Services, but I verify in the aplication and the notifications shows me this messages:

I had the same problem some weeks ago, however, it fixed at the next day, I read this article:

https://launchpad.support.sap.com/#/notes/3281336

So I thought that I would have no problem and now I don't know what to do.

Please, Can anyone tell me if has a similar error or knows how to fix it?