Hi @eMagicJamesOng-5127 ,
resizing directly from D2s_v3 to D2s_v5 isn't possible.
This is because the Ds_v3 series is using a local storage (temp drive) and Ds_v5 series doesn't have a local storage (temp drive).
Source: Limitations
But there is a workaround available: How do I migrate from a VM size with local temp disk to a VM size with no local temp disk?
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten