GNOME Control Center freezes when trying to add a Gmail account

I want to add a Google account on my gnome-control-center online-account. The popup OAuth window for connecting GNOME to Google loads the first page (email), but when I validate, the window freezes and I can't enter my password and validate the connection.

OAuth window freezes:

I get this first window so it's not a graphics driver problem as in this question.

It was working fine until I tried to add another google account (reason for my initial message below), but this may well be completely unrelated, whatever Occam has to say about this.

The problem I have is very similar to this question. I tried both solutions with ENV vars, the first deprecated one WEBKIT_FORCE_SANDBOX=0, and the new WEBKIT_DISABLE_COMPOSITING_MODE=1, with no success.

Here are the log of gnome-control-center -v when trying to add a Gmail online-account. The many lines with reading data from TLS connection has failed: WOULD_BLOCK lead me to several threads related to my problem:

• this thread on archlinux which is exactly the same as mine,but does not provide any answer,
• this thread on gitlab which is a bit different and does not provide solutions either.

I tried updating, removing and reinstalling gnome-control-center, online-account and Geary.

I also had a low memory problem on my system disk, that I solved before trying those updates.

below is my original message*

I have several Google accounts, for the different organizations I work for.

I want to use Geary for those emails. And Geary uses gnome online accounts, to my knowledge.

It seems that you can't add several Gmail accounts. When I try, I can enter my Gmail address in the first Oauth2 window, but when I press Enter nothing happens.

I also tried to had an IMAP and SMTP account, and copy the working settings from Thunderbird, but you can't use OAuth with this option (yet).

Firefox's second Gmail account settings:

Maybe there's a way by manually copying some files.