Hello IgoG,
It may help to try restarting all devices using the Home app to help give them a quick refresh.
Also double-check if the Mac is connected to the internet, and isn't having connection issues in any other apps.
If there happens to be any VPNs or security software installed, try temporarily uninstalling them to help rule out any conflicts caused.
If nothing above helped then try leaving the Home app on the Mac open for 30 minutes. If a reset option appears after that time period you'll want to proceed with that. Resetting the Home app will delete all Home information, including anything stored in iCloud. All Home information will also be deleted from devices using the same Apple ID. After the home is reset, you will need to set up the home again. This includes resetting accessories to factory settings, adding accessories to the home again, recreating scenes, re-establishing home settings, and re-inviting guests to shared homes.
Cheers.