Tells you exactly what and at which line the problem is?

Syntax error: unmatched thing in thing from std::nonstd::__map<_Cyrillic, _$$$dollars>const basic_string<epic_mystery,mongoose_traits<char>, __default_alloc_<casual_Fridays = maybe>>

Sure, strtok is a terrible misfeature, a relic of ancient times, but it’s plainly the heritage of C, not C++ (just like e.g. strcpy). The C++ problems are things like braced initialization list having different meaning depending on the set of available constructors, or the significantly non-zero cost of various abstractions, caused by strange backward-compatible limitations of the standard/ABI definitions, or the distinctness of vector<bool> etc.

It’s not as easy as it sounds, sometimes the screens are all wrong!! https://xkcd.com/722/

Oh, and you can do that even in the official application? I thought it was impossible to be logged into multiple Teams accounts at the same time! (That was one of the reasons I was using Teas in a browser, being able to open another instance in a private window.) Or did they finally fix that, at least?

Access Teams? Do you need anything more than opening the Teams web app in a browser?

uMatrix browser extension. It has been marked archived by Gorhill, last release is two years old, you are supposed to just use uBlock [Origin]. However, it still (luckily) works fine and is exactly what I want. (Sure, I won’t install this for my parents.) The GUI to simply choose what you want the site to be allowed to do is perfect.