It's been a year since you applied for a project manager, but you haven't taken part in continuing education. Your certificate will not expire. The project manager's certificate needs to be renewed every four years (the starting time is the time you can find on the website of the Ministry of Industry and Information Technology after your initial new application is successful), which means that you will participate in continuing education within four years. If you don't do it in the first year, you can postpone it to the second year. If you really feel unsafe, you can consult the relevant personnel of continuing education.