In some cases, admins want to trigger a re-enrollment for SCEP certificates, in the table below, you will find the effect of changing some properties of a SCEP configuration profile on the re-enrollment procedure
Subject name format
Subject alternative name
Certificate validity period
Extended Key Usages (EKU)
To understand and troubleshoot SCEP certificate renewal process in Intune, please check the great article Deep dive of SCEP certificate request/renewal on Intune-managed Windows clients on Oliver Kieselbach's blog.