Likely the artwork simply has a ton of custom formatting like different kerning, letter scaling and so on. this of course won't translate to SVG as native text simply because there is no way to render it in SVG that way and retain the appearance.
I assumed as much, so there's no kerning, no nothing, it's just the type plain as day - and still, it won't translate. But I did just different fonts.. is the program capable of seeing them as different fonts in the code?
Which fonts do work?
Exactly how do you export the file and which options do you use for the text?
How is the text formatted? Are there Ligatures?
I think we can all imagine how an Illustrator error looks like, but could you show the text objects?
I can only use Google Fonts (due to some requirements from my client). Some work and some don't (hence, this cry for help). If it's relevant which exact fonts work and doesn't, I can give a list:
Works: Noto Sans KR, Roboto, Roboto Condensed, Open Sans, Open Sans Condensed, Poppins and Allan.
Doesn't work: Oswald and Quicksand
It might also be worth noting that Roboto, Oswald and Sanchez do not translate to SVG when in the same file.
Some of the designs have several different fonts, so I tried changing them out so I only used one per .ai file, but that didn't work either.
When I 'save as...' I choose SVG from the drop-down, check the 'use artboards' box and I'll attach a screenshot of the last step.
There are ligatures. Both I and my client are Norwegian and we use the letters æ, ø and å as well. So I always check beforehand that all the fonts I use also includes æ, ø and å. When setting up the text I simply hit "T" on the keyboard, type in the words and pick a downloaded font from Google Fonts. The rest is paragraph styling like 'Paragraph' and 'Area Type'. I'll add a screenshot of that too in case I'm not explaining this well enough.