Everything in my OneNote app is read-only and i dont know why

I've already checked the forum and the __Misplaced Sections post didn't help me at all because I don't have any misplaced sections, and technically all my sections and notebooks are synced, or so the app says, but all the content from the notebooks, every single note is read-only, and i have no idea why, ive been using the same account for longer than a decade never had any similar problems only the normal back up ones, that we could fix in a minute.

Recently, I noticed the app asked me to create a new notebook for the default one, and I didn't notice until now that none of my previous notebooks were showing as an option. I can now only add new things to the new default notebook and can't edit nor sync new content added to the notebooks through the computer to the same ones on the app.

Everything is updated and backed up alright, and in the same account with plenty of space left. I really don't know why this happened.
Can anybody help?__