The Status of my dossier is "Sent" however, the Commission hasn't received it yet.

Some Member States have a hierarchical structure based on regional levels and central or higher levels.

In these cases, any dossier sent by a regional level (also called sub-node) is sent to the level located immediately above (the central/higher Member State level of higher node). Then, the central/higher node must send the data to the Commission.

You can check the current level of your data on the search pane.