Can't access C++ (introductory) Course

Question

So, I recently started the C++ introductory course in sololearn and I made it until the Quiz in the first subsection, but I didn't do it. Never clicked on it and thought I would do it later. Now, when I try to access the course it sends me to this link: https://www.sololearn.com/en/learn/not-found-lesson
In there it just says "Lesson not found
You may not have access or it may no longer exist."
BUT, if I put the link of the course and add "?location=2" as a parameter in the link, it does open up the course (sometimes, like, after opening the link 10 times), but I can't do or click anything?
Now, I have been doing C++ for quite some time now, and I am actually an intermediate/advanced, but our teacher in school forced us to do this course and it counts as ~30% of our grade, so you know, I NEED TO FIX THIS.
Anyway, thanks for any help. :)
UPDATE 1:
After digging a bit deeper, into the Network and the Console, it seems that I was blocked access due to "Tracking Prevention"?
This is the full error in the console:
not-found-lesson:1 Tracking Prevention blocked access to storage for https://websdk.appsflyer.com/?st=banners,pba&.
not-found-lesson:1 Tracking Prevention blocked access to storage for https://websdk.appsflyer.com/?st=banners,pba&.
not-found-lesson:1 Tracking Prevention blocked access to storage for https://wa.appsflyer.com/events?site-id=d399f690-c1d5-4c13-9afb-70e03be935be.
not-found-lesson:1 Tracking Prevention blocked access to storage for https://wa.appsflyer.com/events?site-id=d399f690-c1d5-4c13-9afb-70e03be935be.
not-found-lesson:1 Tracking Prevention blocked access to storage for https://wa.appsflyer.com/events?site-id=d399f690-c1d5-4c13-9afb-70e03be935be.

It still doesn't make any sense though lol.

Answer 1

I solved the problem by going to my profile, deleting the course and then doing it all over again and now it works.
Now, was this solution practical? Absolutely not!
Did it work though because I knew how to code? Yes!
Should the SoloLearn team do something so this doesn't happen to someone who can't restart the course in time? By all means Yes!

Answer 2

Sounds like you are trying to access it from the web page?
This is the link for me in the android mobile app and it seems to be working.

https://www.sololearn.com/learn/courses/c-plus-plus-introduction

If you still cannot open it please write an email to [e-mail] and explain your problem, possibly with record of screenshots and detail of the error messages, might give you a quicker feedback. Also notify your teacher about the issue... if he set this requirement, he should also be in control of the technical circumstances that block you from fulfilling this part.

Answer 3

Hey Tibor,
Yes, I am trying to access it from the web page.
Also, thanks for the link, but it still doesn't work.
I will send an email to both sololearn and my teacher thanks for the heads up :)