You will need to exchange the extruder shell with the insert for the tube.
Customer Service will send you one if they answer in 2-5 ‘working’ days.
Some other users glued some other tube holder on top of the shell to continue to print until they receive the spare part.
I used only spool holder and pushed the filament in manually in the meantime.
Please clean up also extruder shell before you continue to print! The reason is that the tube holder uses some small steel plates to hold the tube in place and if they are ‘lost’ (and that’s why the tube is not holding in anymore) this small peace of metal goes into extruder shell and in some cases (at least with me and one other colleague here) the magnet of the cutter picks it up and in some time the cutter may be blocked!
For some other feedback on same issue please look here: https://forum.creality.com/t/extruder-ptfe-connector/25464