I am surprised it was working, I am just looking at the IMT, and for Exch 2016 with SME7.2, the last CU update mentioned is -CU11.
According to IMT:
SME 7.2.1 supports : Exchange Server 2016 (SE/EE) : CU11
SME 7.2 supports : Exchange Server 2016 (SE/EE) : CU11
NetApp IMT is a recommended tool to check the compatibility matrix:
(Sometimes matrix is not updated b'cos product is replaced with other products SnapCenter etc, but it does not mean it may not work but that CU looks way off).
Just FY: SME7.2.x has reached end-of-full/version support - 30-Nov-2021.