Ditto, since day one, I have used the DJI Fly App with my two drones; ( Air 2 previous), Air 2s, and Mini2 current. Both the Drones and I -pad mini 5, have the most current updates.
Have a good time.
I go to the UK and greater Europe a lot and to my knowledge you have done all the right things.
Remember to use the same common sense and be aware of the "No Fly" zones, which usually includes the major landmarks and city...
I have had that issue if I haven't flown in a month or so. You won't need to log in for every flight.
Just good practice to log in before you leave home or before you are out of cell range.
It's also good to check the area you may be flying in...
Wow ! lots of information and I hope you realize that in the EU and most other countries you are better off with a sub 250g drone.
The UK is the easiest and has the most freedom, however localities do have a variety of restrictions.
In the EU...