I had the same problem.
It was solved changing the HDMI cable to the other port (I moved it from HDMI1 to HDMI0, the closest to charging port).

No other change in configuration was required.

After update to version 7.2.2 (clean install) in my Raspberry Pi 4 it is not possible to start retroachievements.

I enabled RetroAchievements in EmulationStation menu (game settings -> retroachievement settings)
After that, checking recalbox.conf my settings are there

global.retroachievements=1
global.retroachievements.hardcore=1
global.retroachievements.username=MyUser
global.retroachievements.password=MyPassword

But, when I start a game in retroarch-fbneo I get an error message in a popup "missing retroachievements account information" and then the game starts without achievements enabled.
And, if I open retroarch settings menu (hk+B) the retroachievements settings are blank.
The achichievements are enabled only if I set RA login info in retroarch. But this setting is lost when i close the game.