Default Currency based on Country NOT WORKING

I’m having an issue with the “Default Currency based on Country” functionality. It doesn’t seem to be working as expected.
• The system is not switching currencies automatically based on the customer’s country.
• I’ve already checked the plugin settings and confirmed that the rules for country–currency mapping are set up.
• Cache has been cleared, and I also tested in incognito mode, but the problem persists.

Could you please investigate and advise on how to fix this issue?