iPhone: how to get an appointment at the Genius Bar Apple Store

In recent days, it is sometimes impossible to obtain, on the Apple Store app, an appointment at the Genius Bar for an intervention on an iPhone (or other iOS product). Conversely there are no problems for Mac. In this case, if the app sends you messages like those below, try your luck on the Apple Support website. For some stores that do not display any booking from the app, we saw slots available from the web page. This is the case eg for Apple Store Rosny 2 or Lille. Others, however, remain inaccessible in both cases, as Lyon Confluence ...