When I try to edit the Settings I get this warning:

"Access Denied
We’ve detected unusual activity associated with your request and have blocked it due to security concerns. This action has been taken to protect your information and the integrity of the host service."

Clicking on "Need Help" get's me to this page: https://support.monarx.com/en/
Of course there's nothing in the help that could pinpoint the issue.

Where is this coming from?

Btw: Newest Versions of Craft and Maps
The plugin works, but not the settings.

Very strange.

I've tried with a VPN: same result.