Steps to reproduce:

All this steps at short attached video.

1. Create a host "sysadmin-to-office.ru"
2. Navigate to Web screnarios
3. Create web Scenario
   1. Name "Check sysadmin-to-office.ru"
   2. Add steps:
      1. Name: Check sysadmin-to-office.ru
      2. URL: http://sysadmin-to-office.ru
      3. Follow redirects - Yes
      4. Required status codes - 200
4. Goto Monitoring - Hosts - click to out host - Latest Data
5. We see error "Last error message of scenario "Check sysadmin-to-office.ru"." (screenshot):
   1. Click History
   2. 01/07/2022 01:01:13 AM    
      URL using bad/illegal format or missing URL: Failed to convert сисадмин-в-офис.рф to ACE; could not convert string to UTF-8  (screenshot)

As I understand it, the problem occurs at the stage of redirecting from sysadmin-to-office.ru to сисадмин-в-офис.рф. 

if i change url to http://сисадмин-в-офис.рф it works fine! 

All this steps at short attached video.

Screenshots attached too.