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The IQ Mini S-Line sensors are compatible with the IQ Panel 2+ so long as it has a 319.5MHz radio installed. Do you have one?
If unsure, the quickest way to check would be to navigate to Settings > Advanced Settings > Enter Installer or Dealer Code > System Tests > Daughter Card Test. Is SRF-319 an option? If so, does it pass the test?
If it does, delete one of the S-Line sensors, wait a couple minutes then reprogram using Auto-Learn Mode. After doing so, test for resolution.
Programming for 3193.5MHz sensors can be found below: