A lot of the icons are not showing

Setting the glyphs one by one, using nerd-fonts cheatsheet solved, by my understanding was that it should come by default on Nerd-Fonts
This information will help us understand your configuration.
You may delete this section if your issue is not font / icon related.
$P9k/debug/font-issues.zsh.Your font settings seem to be all right. If you still have issues,
it is more likely to be a font issue than a Powerlevel9k related one.
$ get_icon_names look correct?Which icon on the screenshot do you consider to be not showing?
All OS icons for instance. My understanding was that it shows a text as fallback for not finding the icon.
Home and folder icons are missing as well
There are others, not on screen, but I'm not worried about then, since I'm not planning on putting them on my config
Just making a guess. You are expecting POWERLEVEL9K_ANDROID_ICON in the output of get_icon_names to show as Android logo but you are seeing And instead. Is this correct?
If so, try running POWERLEVEL9K_MODE=nerdfont-complete zsh and then typing get_icon_names. If this displays the icons you want, you need to add POWERLEVEL9K_MODE=nerdfont-complete _at the top_ of your ~/.zshrc. Or you could switch to Powerlevel10k, which allows you to define your options anywhere in the configuration file. It's also much faster.
Running POWERLEVEL9K_MODE=nerdfont-complete zsh messed up all icons

My zshrc

Running POWERLEVEL9K_MODE=nerdfont-complete zsh messed up all icons
This means your font doesn't support these icons. If you want these icons in your prompt, you need to install a patched font from Nerd Fonts.
P.S.
Powerlevel10k is bundled with zprezto just like Powerlevel9k. You can switch by changing "powerlevel9k" in ~/.zpreztorc with "powerlevel10k". These themes are compatible, so you won't need to change any configuration. 10k is just faster. You can always switch back.
Hm, somehow I got it to work.
Apparently, it was the POWERLEVEL9K_MODE=nerdfont-complete placement.
Changing to PowerLevel10k made it work
Many thanks
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Running POWERLEVEL9K_MODE=nerdfont-complete zsh messed up all icons
