In dr you have +48-421-674-8974 and 8-421-674-8974... which are not the same so your:

Apparently the suggested phone is found in multiple lines

is false.
Don't conclude too fast about the need to "look over":-)

It seems it was already reported by pizzaman3000 before, if you're sure it's a bug, raise an issue.

I get this error on one specific test.

Expected string length 75 but was 40. Strings differ at index 0.
Expected: "Phone => 8-421-674-8974, Name => Elizabeth Corber, Address =>..."
But was: "Error => Too many people: 8-421-674-8974"
-----------^

Apparently the suggested phone is found in multiple lines, yet I'm expected to return an entry. This is c# and there has to be a mistake with this test. Apparently its also a fixed test.

This Kata needs to be looked over, way too many bugs across different platforms from what I read.

I did not find out and I've had no responses.

Curious about this too. Kinda takes the fun out of it.

Have you had any response about this? or did you find out on your own?

How do I see my self in my clan's ranking I used to see my self there and now I don't, I'm just not in the list.

+1 to this guy, there is no such angle as 0.
You got your tests wrong.

I had to add to my if statement an equals in my solution to pass the tests : if((a+b)<=180).

During submission I've had a failure in test:
Time: 308ms Passed: 20 Failed: 1 Errors: 1

Testing: 149, 31; Expecting: 0
Expected: 0, instead got: 'The triangle with given angles can't exist'

As I remember geometry an angle in triangle can't be a zero. But this test expects a 0 angle. Or is there so-called flat triangle possible here?

What the fuck... how is this a serious Kata?

Great solution, this should be at the top.