LINE Account Search Restriction? All user searches return "User not found"

Hi everyone, since a few days my LINE account seems to be restricted - when I search for any LINE ID (even ones I know exist), I always get "User not found". When I try searching the exact same IDs from a friend's phone, they work fine and the users are found.

Has anyone experienced this? Is there a way to get the account unrestricted?

Note: I've been testing an app integration which required searching for multiple users, this might have triggered some anti-spam measure.

Thanks in advance