Hi @Viet anh Tran ,
the forum supporting Exam/Certification questions has been moved by Microsoft to a new platform.
Microsoft Training & Certification is supported on their own forums (new platform!):
Pearson VUE Support:
Pearson VUE - Customer Service
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten