It’s been days i can’t add anyone to my friendlist (error 5001) and now nobody that I invite to my group receives my invites, and i don’t receive any invites either, can somebody help me please?
Probably your friend list did reach the limit.
More info here:
https://us.battle.net/support/en/article/133549
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Brother, I tried this method minutes ago, but i just can’t find a way to cancel my friend request inside “battle.net app”. Do you think there might be another way I could fix this?
I would remove some friends off my list.
In first, I would go for people with closed profiles. 
If you’re trying the battlenet mobile app it doesnt have that option you have to download battle net on a computer and do it there