I've tested and confirmed that the issue is reproducible on my end as well. After consulting with our senior team members, we've concluded that it's best to reach out to the Bing team for support. The Address Input in Power Apps uses the Bing Connector, which retrieves data from Bing's Data Source. Since Bing Maps doesn't display the municipality, it's expected that Power Apps won't show it either.
I'm sorry that we can't do much to help in this case as it's beyond our scope. Please contact the Bing Team for further assistance. Hopefully, they can resolve this issue soon.
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