What does the word "于" mean when it's used along with "不容'? Because of the word "于" here, I have a hard time understanding this sentence.


  这是天地不容于此的缘故.


In my attempt to understand it, I've searched for a few similar sentences to be compared. Unfortunately, the word "于" seems to have different meanings in each sentence (I might be wrong).


  
  专业出版许多移民因感到不容于社会而苦恼
  曲高和寡不容于世
  


I assume in these it means 'by'. (1. Professionals state that immigrants are vexed because they felt they're not accepted by the society? 2. Geniuses/highbrows aren't tolerated by the world?)


  
  白鸟哀婉，不容于天之澄碧，亦不容于海之幽蓝.
  


I feel the  "于" in this sentence is the most similar with the one in my original sentence, so I'm not sure about its meaning.

So, my questions are:


What does the "于" in my original sentence mean?
Is "于" necessary when I used "不容"?
Does the usage of "于" always turn the sentence into passive voices (the translations) as it does in example 1 and 2?
于 in your first sentence means 在。

Therefore, 不容于此 means would not be contained here, although this sentence seems weird without context.

于 is not necessary for 不容，for example, you could say


  这样的行为绝对不容姑息


And it means actions like this will never be allowed in any sense.

于 is neutral, you would also see


  我生于 1997 年


It simply means I was born in 1997 and has not emotional implication.