strange. to my understanding renouncing your old citizenship was only ever required when you apply for a new citizenship. once you have acquired the new one while keeping the old one you would not even come into a situation where you would be forced to renounce the old one because no one from those two countries would ever ask you. other countries might in their visa applications, but they won't challenge your dual citizenship either. the only exception is if you got both as a child, then when you turn 18 you may still have to choose.