The "ai" in "faisons" should be pronounced like the "ai" in "faites". You can go to the Google translator, choose French as the language and enter "faisons", then click on the litlle loudspeaker icon and hear it pronounced for you. -- Chris (not a native speaker).

Merci pour votre réponse, Claus. To me faisons sounds like fesons (not like fésons) I found this on a blog: The standard pronunciation of faisons is indeed [fəzɔ̃]... And this explanation at https://leconjugueur.lefigaro.fr/conjugaison/verbe/faire.html Règle du verbe faire: Même si on écrit, nous faisons, on le prononce comme nous fesons. So, I was wondering about such an unusual pronunciation.

Oui, tu as peut-être raison. Cettes différences sont difficile à partager par un message écrit. Quand je dis "faisons" de voix haute ça sonne plus comme f"é"sons. --Chris.

I find this link helpful https://www.thoughtco.com/faire-to-make-to-do-1371033. Here is a quote explaining a bit about the irregular pronunciation of faisons: If the nous form is more predictable, its pronunciation is not. Nous faisons is pronounced "feu zon," not "fay zon." Since the imperfect indicative is based on the nous form of the present, this irregular pronunciation carries throughout the imperfect: Il faisait = il feuzay

I bet this depends on where the person is from no? Check this out, on forvo, one prononciation sounding like "fesons" from France, another as you'd expect if "ai" were pronounced as it usually is, from Canada,... https://forvo.com/word/ll_faisait_froid/#fr

I meant to say "fesait" above. Since people pointed out that faisait/feson and other conjugations of faire share this pronunciation in French from France.