Having read a few of the posts above I feel just a little smug!
I applied in June this year using the French government web site, submitting one of my early tax returns, a 2020 EDF bill & a copy of my passport. A dossier number arrived by return email. A few weeks ago I was invited to the prefecture in Angouleme for fingerprinting. At the appointed minute I was invited in, asked to confirm my details & sign a document, my thumb prints only were taken & my photo booth picture cut out of the block of 6. Out in 5 minutes with an assurance that my cds will be sent to me in about 6 to 8 weeks.
A friend applied for his last year (pre-Brexit) & is still waiting for his summons to the prefecture although he does have a dossier number.
Funnily enough, I also posted on the subject of driving licences (UK driving licences after Brexit - I'm glad I did not panic!) also in 2019 & was confident until the beginning of this year when things looked a little shaky! However, I felt that nobody would relish a sudden influx of stuck-in-their-ways older drivers being suddenly unleashed onto unsuspecting driving schools & that common sense would prevail. Fortunately it did & the status quo has resumed.