windows - Cannot extend partition

I am trying to extend volume in windows using Disk Management.I came across this:

"Extend Volume" is grayed out. The reason is that
you can extend a partition in Disk Management only under the condition that
there is adjacent unallocated space.

But even after making the partition and the unallocated space contiguous i cannot extend my existing partition. (Extend partition is greyed out why and what should i do?)

Why cant i extend volume even if the unallocated space is right next to the partition i want to extend.

Why is extend volume greyed out still?

P.S I found this but couldn't completely understand it can someone explain this to me.

Thanks!