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I have a quick question. Why exclamation mark doesn't work in UTM parameters.

I will give you an example - this url which is generated by external tool doesn't work and redirect to home page:

https://www.example_site.com/xx/xx/xxx?utm_source=facebook&utm_medium=cpc&utm_term=XX&utm_campaign=Test_Test_Test&utm_id=xx1!12345678

But when i manually delete ! mark from utm_id (last part) it starts working:

https://www.example_site.com/xx/xx/xxx?utm_source=facebook&utm_medium=cpc&utm_term=XX&utm_campaign=Test_Test_Test&utm_id=xx112345678

utm_id is generated automatically so I cannot change it other way then manually all the time.

How could I solve this problem and why this is happening?

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